Subject: [IGSREPORT-6796] Wk 1041 NOAA NGS Analysis Report
From: kass <[email-masked]>
To: [email-masked]
Date: Fri, 7 Jan 2000 07:30:16 -0500 (EST)

******************************************************************************
IGS Electronic Report   07 Jan 04:35:31 PST 2000      Message Number 6796
******************************************************************************

Author: NOAA/NGS GPS Analysis Center                                            
                                                                                
******************************************************************************* 
NGS ANALYSIS REPORT GPS WEEK 1041 (Dates: 99 Dec 19 - 99 Dec 25)                
******************************************************************************* 
National Oceanic and Atmospheric Administration (NOAA)                          
National Geodetic Survey (NGS), SSMC-3, N/NGS2                                  
1315 East-West Highway                                                          
Silver Spring, MD, USA  20910                                                   
                                                                                
contacts: William Kass    301-713-3209 ext.164   [email-masked]             
          Robert Dulaney  301-713-3209 ext.168   [email-masked]              
fax:                      301-713-4322                                          

PRODUCTS SENT TO CDDIS:                                                         
------------------------------------------------------------------------------  
 NGS10417.SUM         this text file                                            
 NGS10417.ERP         Earth rotation parameters for GPS Week 1041               
 NGS10417.SNX         weekly GPS coordinate solutions for GPS Wk 1041           
 NGS1041n.SP3         GPS ephemerides for GPS Week 1041, SP3 format (n=0..6)    
------------------------------------------------------------------------------  
                                                                                
SOLUTION CHARACTERISTICS:                                                       
------------------------------------------------------------------------------  
 Software             page5 developed at NOAA                                   
 Terr. Ref. Frame     nominally, ITRF96 at current epoch                        
 Observables          double-differenced carrier phase at 30-sec. intervals     
 Arc Length           24 hours                                                  
 Elevation Cutoff     15 degrees                                                
 Reference            file://igscb.jpl.nasa.gov/igscb/center/analysis/noaa.acn  
------------------------------------------------------------------------------  
                                                                                
STATISTICAL SUMMARY OF DAILY SOLUTIONS:                                         
------------------------------------------------------------------------        
          NUMBER      POST-FIT                                                  
 DOY   OBSERVATIONS   RMS (MM)   NO. SAT.   NO. SITES   NO. CONST. SITES        
------------------------------------------------------------------------        
 353     697900         11.1       27          64               42              
 354     704151         11.4       27          65               42              
 355     708847         11.3       27          66               41              
 356     672888         11.7       27          63               43              
 357     660982         11.6       27          64               42              
 358     606592         11.6       27          60               38              
 359     598087         11.5       27          58               37              
------------------------------------------------------------------------        
                                                                                
NUMBER OF OBSERVATIONS BY SATELLITE AND DOY:                                    
----------------------------------------------------------------------          
 PRN        353      354      355      356      357      358      359           
----------------------------------------------------------------------          
  01      20485    19782    20698    19990    19331    18446    19250           
  02      21935    23879    24011    22660    21535    19185    19330           
  03      30127E   30534E   30080E   28563E   26173E   25704E   25702E          
  04      26744    26242    25554    24816    23704    20560    19968           
  05      24113    23883    23517    23007    23019    22149    21995           
  06      32752E   33061E   33533E   30981E   32355E   27646E   28773E          
  07      29973E   32134E   29530E   28216E   28757E   25585E   26531E          
  08      25161    23589    23434    23610    21512    21708    21338           
  09      51886    53720    57578    53192    49912    47390    46186           
  10      64104E   65034E   63948E   61430E   61526E   55854E   56300E          
  13      46078    46946    51328    47992    44226    39000    36784           
  14      63502E   63062E   64108E   60656E   62992E   56616E   53072E          
  15      34432    32958    33022    30880    26988    29012    28776           
  16      60502E   61342E   62534E   58864E   58854E   53768E   50514E          
  17      41352    40582    38180    37146    38032    34642    39650           
  18      51582    49612    51054    48014    46506    46566    43702           
  19      43956    47686    47914    45428    43196    40788    40002           
  21      65686E   64072E   65154E   63752E   63296E   56032E   57344E          
  22      40006    39904    39642    39932    39398    36704    32124           
  23      65518E   69014E   66074E   65954E   64772E   56330E   59132E          
  24      51200    49818    52856    50202    50756    43000    40572           
  25      49452    51380    51440    47476    47944    44410    42324           
  26      47918    47196    51162    43210    48154    41110    38858           
  27      42280    44902    45898    40954    40950    41358    36110           
  29      43330    41744    43326    41058    40930    31064    32758           
  30      50804    53084    50890    49062    49652    47640    47032           
  31      59632E   60038E   60872E   56888E   51108E   49934E   49160E          
----------------------------------------------------------------------          
NOTE: E = satellite eclipsing during day                                        
                                                                                
GLOBAL LIST OF SITES USED DURING WEEK:                                          
-----------------------------------------------------------------------------   
global: ALGO AREQ ASC1 AUCK BAHR BAKO BRMU CAS1 CHAT COCO CRO1 DAV1 DRAO EISL   
global: FAIR FORT GODE GOL2 GRAZ GUAM HARK HOB2 IISC IRKT KELY KERG KOKB KOSG   
global: KOUR LHAS LPGS MAC1 MAG0 MALI MAS1 MAW1 MCM4 MDO1 METS MKEA NLIB NOUM   
global: NTUS NYAL OHIG ONSA PERT PETP PIE1 POL2 POTS REYK RIOG SANT SHAO STJO   
global: SUTH THU1 TID2 TIXI TROM TSKB VILL WES2 WHIT WTZR WUHN YAKZ YAR1 YELL   
global: ZWEN                                                                    
-----------------------------------------------------------------------------   
                                                                                
NUMBER OF OBSERVATIONS BY SITE AND DOY (AVERAGE PER BASELINE):                  
----------------------------------------------------------------------------    
       ION CODE$                                                                
 SITE   0123456    353      354      355      356      357      358      359    
----------------------------------------------------------------------------    
 ALGO*  2222222  13284    13254    12042    12767    12300    12441    12370    
 AREQ*    32232                     6841     5297     7085     6557     5655    
 ASC1    554444            4780     7401     5560     5796     5152     5315    
 AUCK*  3333332  12670    12020    12115    12141    11560    11728    11971    
 BAHR*  5454443   6989     8303     8176     9417     9451     8530     8591    
 BAKO   3 3 222  11359             10594              9687    10230    10590    
 BRMU*  2222222  13000    12556    12807    12084    12853    12384    11898    
 CAS1*  4444545   9116     7932     9351     7333     7167     5755     5460    
 CHAT*  3333332  11969    12961    12199    12217    12302    12497    12703    
 COCO   3343333  11504    11055    12087    11293    10956    11353    11828    
 CRO1   3433333   8337     8242     8074     8052     8977     7946     8481    
 DAV1*  4433454  10455     9726    11013     6799     5712     4944     5427    
 DRAO*  2222222  13548    13680    13423    13722    13486    13526    13457    
 EISL   222 232   4927     5311     5409              5912     5769     5516    
 FAIR*  2 1123    7893             13258    13187    11736    13533             
 FORT*  44 5555   3070     4528              5560     4371     4006     4811    
 GODE   322 223  12668    12734    11791             11273    10847    10721    
 GOL2*  2222222  11257    11412    11230    11517    11202    10953    11358    
 GRAZ*  22211    14342    14722    14651    14389    14499                      
 GUAM*  4444444   6592     7044     6880     6136     4462     6077     6082    
 HARK*  3333333   8410     8551     9104     8670     8438     9328     9878    
 HOB2*  3233222  12143    12914    12396    13166     9694    11740    11718    
 IISC   3333333   5578     5871     6242     6037     6084     6153     6082    
 IRKT*  2111122  11874    12610    12364    12236    12113    12126    12070    
 KELY   4333554   8315     7411     8909     9821     8768     7587     9398    
 KERG*  2333322  10272    10848    10074     7056     6152     9555     9840    
 KOKB*  4434333  11428    11787    12167    11535    11691     9694    10675    
 KOSG*  2212122  14146    14161    13967    14030    13169    10781    13491    
 KOUR*  453445    2920     3268     3289     3291     4013                      
 LHAS*   2 2232            8915              7904     7995              7963    
 LPGS   443433    6045     6675     7370     8911     8196     7065             
 MAC1*  3 33333  11183             10863    10716     6070     9741    10039    
 MAG0   1111111  11447    11880    11442    11324    10498    11360    11524    
 MALI*  3343332   5582     5899     5724     6102     5999     6526     7092    
 MAS1*  5555545  12799    12168     9974    12229    12632    10609    11736    
 MAW1   333 344  11368    11047    11169                       7601     8313    
 MCM4*  4544455   9304     7143     8782     8770     7469     7563     7170    
 MDO1*  2222222  12871    12337    11890    12893    12659    12648    12502    
 METS   2111122  13195    13362    12811    12689    12896    12942    12942    
 MKEA   3333233   9414     9884    10062     9589     9441     7852     9031    
 NLIB*  2222222  12655    12085    10446    12282    11900    12143    12090    
 NOUM     33                       12332    12341                               
 NTUS   33333    10054     9297    10337     8331     8535                      
 NYAL*  5433465  15017    15386    11773    12170    13371    13290    13486    
 OHIG*     3333                              9966    10070    10038     5961    
 ONSA*  22111 2  13938    14406    13530    13972    13269             13718    
 PERT*  223333   12139    12532    11303    11244    11358                      
 PETP   1111111  11608    12017    11915    11771    10426    11752    11852    
 PIE1*  2221122  13275    12764    13150    13574    13371    13359    13265    
 POL2   1221121  10347    11398    11070    10895    10934    11800    10442    
 POTS*  2211122  15158    14968    15060    15040    14028    14223    15364    
 REYK    322232            6931    11939    12206    11518    10942    11527    
 RIOG   444       8493     9125     7174                                        
 SANT*  453 433   7284     7837     6800             10355     7577     7060    
 SHAO*   23               11382     8648                                        
 STJO   2222222  12733    12552    12551    12614    12359    12628    12741    
 SUTH   2222222   9805    10202    11074    10396    10295    11352    12208    
 THU1*  55 5454  10983    10856              7113    11321    10808    11961    
 TID2*  3333333  13043    12840    13419    12361    11778    12598    13669    
 TIXI   2211332  13672    13818    13108    13006    13485    13551    13612    
 TROM*  3222     15118    12840    10592    14511                               
 TSKB*  2222 22   9969    10326    10126     9833              9796     9855    
 VILL*  222222   12929    12603    12649    12514    12756     6928             
 WES2*  2222222  13235    13296    13051    12594    12884    13079    12753    
 WHIT   2211132  10795    13705    14353    14316    13999    13344    13628    
 WTZR*  22 1 1   14586    14445                                                 
 WUHN   2222223  10936    11441    10118    10823     7925    10550     9793    
 YAKZ   1111111  13345    13333    13202    12836    12833    12970    13083    
 YAR1*  2333322  11523    11833    12688    10662    10585    10470    10922    
 YELL*  3322243  12921    13018    14098    14144    13047    12666    13004    
 ZWEN*  221112   13475    13207    12232    12338    12396    12289             
----------------------------------------------------------------------------    
NOTES: * Indicates sites with constrained coordinates.                          
       $ Ion codes given for each day with data. Values are an index of         
         (nominally) mean ionospheric variability with lower values denoting    
         less variation. > signifies values exceeding 9.499. Some types of      
         instrumental problems cause increases in this index unrelated to       
         ionospheric effects.                                                   
                                                                                
STATION GEODETIC STATISTICS FOR WEEK:                                           
--------------------------------------------------------------------------------
        AVERAGE          AVERAGE GEOCENTRIC COORDINATES        RMS RESIDUAL (MM)
 SITE    EPOCH         X (M)          Y (M)          Z (M)        N     E     U 
--------------------------------------------------------------------------------
 ALGO*  51534.5     918129.4584  -4346071.2499   4561977.8141     1     0     0 
 AREQ*  51535.5    1942826.7716  -5804070.2601  -1796893.9595     1     0     0 
 ASC1   51535.0    6118526.0695  -1572344.6893   -876451.1601     6    38    11 
 AUCK*  51534.5   -5105681.0760    461564.0440  -3782181.6933     3     2     3 
 BAHR*  51534.5    3633908.9671   4425275.5083   2799861.3318     2     1     1 
 BAKO   51534.9   -1836968.9919   6065617.0798   -716257.8008     5     4    16 
 BRMU*  51534.5    2304703.5570  -4874817.1860   3395186.8968     2     0     0 
 CAS1*  51534.5    -901776.1571   2409383.4103  -5816748.4853     2     1     3 
 CHAT*  51534.5   -4590670.9861   -275482.8738  -4404596.7438     2     2     3 
 COCO   51534.5    -741950.1316   6190961.6691  -1337768.4679     3     8    10 
 CRO1   51534.5    2607771.1857  -5488076.7478   1932767.6912     2     5    12 
 DAV1*  51534.5     486854.5579   2285099.3036  -5914955.7350     3     2     1 
 DRAO*  51534.5   -2059164.7274  -3621108.4040   4814432.3461     1     1     1 
 EISL   51534.5   -1884951.5634  -5357595.8907  -2892890.5281     5    20    28 
 FAIR*  51534.3   -2281621.4977  -1453595.8049   5756961.8787     1     2     1 
 FORT*  51534.7    4985386.6390  -3954998.5977   -428426.4728     1     0     0 
 GODE   51534.5    1130773.8306  -4831253.5836   3994200.3934     2     2     4 
 GOL2*  51534.5   -2353614.2248  -4641385.3758   3676976.4224     2     1     0 
 GRAZ*  51533.5    4194423.9231   1162702.6098   4647245.3404     1     1     0 
 GUAM*  51534.5   -5071312.7907   3568363.5220   1488904.3023     1     1     0 
 HARK*  51534.5    5084625.3177   2670366.2978  -2768494.5266     1     0     1 
 HOB2*  51534.5   -3950071.4780   2522415.2162  -4311638.2743     2     1     1 
 IISC   51534.5    1337936.6757   6070317.1024   1427876.5887     5     8    15 
 IRKT*  51534.5    -968332.2644   3794425.4201   5018167.7283     2     2     2 
 KELY   51534.5    1575559.2279  -1941827.9435   5848076.4984     4     7    12 
 KERG*  51534.5    1406337.3273   3918161.1191  -4816167.4053     3     1     1 
 KOKB*  51534.5   -5543838.1480  -2054587.0733   2387809.7767     1     0     0 
 KOSG*  51534.5    3899225.2186    396731.8627   5015078.3682     1     1     0 
 KOUR*  51533.5    3839591.4268  -5059567.5597    579956.9474     1     1     1 
 LHAS*  51535.0    -106937.8040   5549269.5868   3139215.7870     2     1     1 
 LPGS   51534.0    2780102.9905  -4437418.8950  -3629404.5952     1     7     5 
 MAC1*  51534.8   -3464038.5606   1334172.8192  -5169224.3072     1     0     1 
 MAG0   51534.5   -2825810.2199   1581232.9261   5477005.4873     2     6    11 
 MALI*  51534.5    4865366.4337   4110737.4924   -331121.6796     2     3     5 
 MAS1*  51534.5    5439192.2611  -1522055.5757   2953454.7451     1     1     2 
 MAW1   51534.3    1111287.1803   2168911.2799  -5874493.6381     5     6     4 
 MCM4*  51534.5   -1311703.2194    310815.0705  -6213255.1516     2     2     2 
 MDO1*  51534.5   -1329998.7104  -5328393.3947   3236504.1655     1     1     0 
 METS   51534.5    2892570.8874   1311843.3770   5512634.0635     2     2     6 
 MKEA   51534.5   -5464105.1346  -2495166.7113   2148291.0103     2     4     8 
 NLIB*  51534.5    -130934.5198  -4762291.7351   4226854.6384     1     0     0 
 NOUM   51534.0   -5739971.5984   1387563.6127  -2402123.4592     3     3     9 
 NTUS   51533.5   -1508022.7783   6195576.6727    148799.4469     4     8    15 
 NYAL*  51534.5    1202430.6019    252626.6726   6237767.5306     2     1     1 
 OHIG*  51536.0    1525872.5476  -2432481.3130  -5676146.1267     1     1     2 
 ONSA*  51534.2    3370658.6350    711877.0721   5349786.8927     1     0     0 
 PERT*  51533.5   -2368687.1095   4881316.5589  -3341796.0439     1     1     1 
 PETP   51534.5   -3576239.7896   1401003.4649   5075177.4816     2     4    11 
 PIE1*  51534.5   -1640916.8310  -5014781.2139   3575447.1027     1     1     0 
 POL2   51534.5    1239971.5051   4530790.0826   4302578.7669     3     4    10 
 POTS*  51534.5    3800689.7354    882077.3136   5028791.2585     1     1     0 
 REYK   51535.0    2587384.4429  -1043033.5068   5716563.9784     3     4     3 
 RIOG   51532.5    1429907.7593  -3495354.7847  -5122698.7021     5     9     8 
 SANT*  51534.5    1769693.4097  -5044574.1677  -3468321.0508     1     0     0 
 SHAO*  51533.0   -2831733.3609   4675666.0160   3275369.4648     0     0     0 
 STJO   51534.5    2612631.1840  -3426807.0307   4686757.8156     2     3     8 
 SUTH   51534.5    5041274.8316   1916054.0562  -3397076.0579     3    14    19 
 THU1*  51534.7     538981.3614  -1388714.8020   6181005.1311     1     1     1 
 TID2*  51534.5   -4460996.2376   2682557.0836  -3674443.5900     1     1     0 
 TIXI   51534.5   -1264873.0950   1569455.7993   6031003.4474     2     5    11 
 TROM*  51533.0    2102940.2978    721569.4139   5958192.1159     1     2     1 
 TSKB*  51534.3   -3957199.2439   3310199.6884   3737711.6606     2     1     1 
 VILL*  51534.0    4849833.7752   -335049.1250   4116014.8567     1     1     1 
 WES2*  51534.5    1492233.3379  -4458089.4887   4296045.9967     1     0     0 
 WHIT   51534.5   -2218337.8628  -2201205.1137   5543057.5515     4     5     6 
 WTZR*  51532.0    4075580.6501    931853.7164   4801568.0636     0     0     0 
 WUHN   51534.5   -2267749.2516   5009154.3088   3221290.7044     2     5     6 
 YAKZ   51534.5   -1915023.3094   2308213.2101   5610224.9567     2     5    10 
 YAR1*  51534.5   -2389025.6731   5043316.9081  -3078530.6149     1     1     1 
 YELL*  51534.5   -1224452.5576  -2689216.1222   5633638.2620     2     0     1 
 ZWEN*  51534.0    2886325.4887   2155998.4435   5245816.1493     3     1     3 
--------------------------------------------------------------------------------
NOTES: * Indicates sites with constrained coordinates.                          
                                                                                
WARNINGS:                                                                       
--------------------------------------------------------------------------------
 353: constrained site LHAS not in data set                                     
    : constrained site SHAO not in data set                                     
    : constrained site AREQ not in data set                                     
    : constrained site OHIG not in data set                                     
    : PRN 01    has < 2/3 as many obs as average                                
    : PRN 02    has < 2/3 as many obs as average                                
    : PRN 04    has < 2/3 as many obs as average                                
    : PRN 05    has < 2/3 as many obs as average                                
    : PRN 08    has < 2/3 as many obs as average                                
    : site EISL has < 1/2 as many obs as average                                
    : site FORT has < 1/2 as many obs as average                                
    : site KOUR has < 1/2 as many obs as average                                
    : DAV1 residual dU > 2*RMS =       3 mm                                     
    : HARK residual dN > 2*RMS =       3 mm                                     
    : SUTH residual dN > 2*RMS =       7 mm                                     
 354: constrained site FAIR not in data set                                     
    : constrained site MAC1 not in data set                                     
    : constrained site AREQ not in data set                                     
    : constrained site OHIG not in data set                                     
    : PRN 01    has < 2/3 as many obs as average                                
    : PRN 02    has < 2/3 as many obs as average                                
    : PRN 04    has < 2/3 as many obs as average                                
    : PRN 05    has < 2/3 as many obs as average                                
    : PRN 08    has < 2/3 as many obs as average                                
    : site ASC1 has < 1/2 as many obs as average                                
    : site EISL has < 1/2 as many obs as average                                
    : site FORT has < 1/2 as many obs as average                                
    : site KOUR has < 1/2 as many obs as average                                
    : AUCK residual dU > 2*RMS =       7 mm                                     
    : DAV1 residual dN > 2*RMS =       6 mm                                     
 355: constrained site FORT not in data set                                     
    : constrained site THU1 not in data set                                     
    : constrained site WTZR not in data set                                     
    : constrained site LHAS not in data set                                     
    : constrained site OHIG not in data set                                     
    : PRN 01    has < 2/3 as many obs as average                                
    : PRN 02    has < 2/3 as many obs as average                                
    : PRN 04    has < 2/3 as many obs as average                                
    : PRN 05    has < 2/3 as many obs as average                                
    : PRN 07    has < 2/3 as many obs as average                                
    : PRN 08    has < 2/3 as many obs as average                                
    : site EISL has < 1/2 as many obs as average                                
    : site KOUR has < 1/2 as many obs as average                                
    : DRAO residual dU > 2*RMS =       1 mm                                     
    : STJO residual dE > 2*RMS =       5 mm                                     
 356: constrained site SANT not in data set                                     
    : constrained site WTZR not in data set                                     
    : constrained site SHAO not in data set                                     
    : PRN 01    has < 2/3 as many obs as average                                
    : PRN 02    has < 2/3 as many obs as average                                
    : PRN 04    has < 2/3 as many obs as average                                
    : PRN 05    has < 2/3 as many obs as average                                
    : PRN 07    has < 2/3 as many obs as average                                
    : PRN 08    has < 2/3 as many obs as average                                
    : site AREQ has < 1/2 as many obs as average                                
    : site KOUR has < 1/2 as many obs as average                                
    : ASC1 residual dE > 2*RMS =      78 mm                                     
    : CRO1 residual dE > 2*RMS =      12 mm                                     
    : NYAL residual dN > 2*RMS =       4 mm                                     
    : NYAL residual dU > 2*RMS =       3 mm                                     
    : SUTH residual dE > 2*RMS =      28 mm                                     
 357: constrained site TROM not in data set                                     
    : constrained site TSKB not in data set                                     
    : constrained site WTZR not in data set                                     
    : constrained site SHAO not in data set                                     
    : PRN 01    has < 2/3 as many obs as average                                
    : PRN 02    has < 2/3 as many obs as average                                
    : PRN 03    has < 2/3 as many obs as average                                
    : PRN 04    has < 2/3 as many obs as average                                
    : PRN 05    has < 2/3 as many obs as average                                
    : PRN 08    has < 2/3 as many obs as average                                
    : PRN 15    has < 2/3 as many obs as average                                
    : site FORT has < 1/2 as many obs as average                                
    : site GUAM has < 1/2 as many obs as average                                
    : site KOUR has < 1/2 as many obs as average                                
    : MAC1 residual dN > 2*RMS =       3 mm                                     
    : ONSA residual dN > 2*RMS =       2 mm                                     
 358: constrained site GRAZ not in data set                                     
    : constrained site KOUR not in data set                                     
    : constrained site ONSA not in data set                                     
    : constrained site PERT not in data set                                     
    : constrained site TROM not in data set                                     
    : constrained site WTZR not in data set                                     
    : constrained site LHAS not in data set                                     
    : constrained site SHAO not in data set                                     
    : PRN 01    has < 2/3 as many obs as average                                
    : PRN 02    has < 2/3 as many obs as average                                
    : PRN 04    has < 2/3 as many obs as average                                
    : PRN 05    has < 2/3 as many obs as average                                
    : PRN 08    has < 2/3 as many obs as average                                
    : site DAV1 has < 1/2 as many obs as average                                
    : site FORT has < 1/2 as many obs as average                                
    : POL2 residual dN > 2*RMS =       5 mm                                     
 359: constrained site FAIR not in data set                                     
    : constrained site GRAZ not in data set                                     
    : constrained site KOUR not in data set                                     
    : constrained site PERT not in data set                                     
    : constrained site TROM not in data set                                     
    : constrained site VILL not in data set                                     
    : constrained site WTZR not in data set                                     
    : constrained site ZWEN not in data set                                     
    : constrained site SHAO not in data set                                     
    : PRN 01    has < 2/3 as many obs as average                                
    : PRN 02    has < 2/3 as many obs as average                                
    : PRN 04    has < 2/3 as many obs as average                                
    : PRN 05    has < 2/3 as many obs as average                                
    : PRN 08    has < 2/3 as many obs as average                                
    : site FORT has < 1/2 as many obs as average                                
    : BRMU residual dN > 2*RMS =       5 mm                                     
    : KELY residual dU > 2*RMS =      24 mm                                     
    : YELL residual dN > 2*RMS =       4 mm                                     
--------------------------------------------------------------------------------