#   yearbase = 2017
#    refuv_inputfile='a_ex.gps',
#    refuv_source='nav',
#    ens_len=300,
#    bl_half_width=3,
#    pgmin=50,
#    rl_startbin=2,
#    rl_endbin=20
   49.734988        1e+38        1e+38
   49.738461        1e+38        1e+38
   49.741933 0.0120306537569 0.386824011702
   49.745405 0.119415089829 0.47346143746
   49.748877 0.11736019052 0.36999649082
   49.752350 0.00624642233256 -0.03120833415
   49.755822 0.0770895325848 -0.101816617312
   49.759294 0.193914784106 -0.0928442498567
   49.762766 -0.42571230177 -0.981708829831
   49.766238 -1.23634107621 -1.49068768893
   49.769711 -1.21651638352 -1.16931377517
   49.773183 -0.440035273446 -0.322890002586
   49.776655 0.165876802918 0.109564352823
   49.780127 0.290564215237 0.00659452707639
   49.783600 0.079024509377 0.00308136135697
   49.787072 0.00511413064868 0.000665974401637
   49.790544 -0.00211449928801 -0.00296145783895
   49.794016 -0.0022139355177 0.00406864705053
   49.797488 0.00519051088502 -0.0120337924569
   49.800961 -0.00507362999629 0.00205355931518
   49.804433 0.00665780686344 0.0060312785013
   49.807905 -0.0137650702073 0.10376971281
   49.811366 -0.0210093753324 0.474422915338
   49.814838 0.0472187943034 0.454958468097
   49.818310 0.0486185593263 0.309815248099
   49.821782 -0.104268711401 0.307748755373
   49.825255 0.154714412188 0.0451165587524
   49.828727 -0.0224944189183 0.0798976571255
   49.832199 0.0340207195758 0.14376362099
   49.835671 0.016415995847 0.13833307868
   49.839144 0.123461384614 0.263965880261
   49.842616 0.185728326877 0.452389893657
   49.846088 0.17663761429 0.414699058484
   49.849560 0.0271922138266 0.23371173938
   49.853032 0.081725957497 0.355421852766
   49.856505 0.108757304037 0.276410210171
   49.859977 0.139338528742 0.304008493337
   49.863449 -0.036162320863 0.62315102318
   49.866921 0.0271814734311 0.424138866935
   49.870394 -0.209480663755 0.52316102288
   49.873866 -1.02204081499 1.89121536357
   49.874907 -1.52414016993 2.72027066268
   50.880995 -0.0457725892214 3.9838409449
   50.884468 -0.111745921063 -0.905932395068
   50.887940 -0.406138789843 -0.295138896547
   50.891412 0.0656449000089 -0.3813050973
   50.894884 0.0887319152511 -0.245356836395
   50.898356 -0.419743334818 0.313825153195
   50.901829 -0.106832308675 0.110896464392
   50.905301 0.479871542666 -0.0585079579221
   50.908773 0.574927498613 0.275429101123
   50.912245 0.685458043689 0.275247072504
   50.915718 0.591959707202 0.223308831789
   50.919190 0.149004840694 -0.15203480732
   50.922662 -0.0106453679573 -0.00238459143438
   50.926134 0.0324641442899 -0.00208556576662
   50.929606 -0.0730566927074 0.0279391857784
   50.933079 -0.281210907275 0.258222009807
   50.936551 -0.390911416396 0.260429645863
   50.940023 -0.380437838368 0.182815607022
   50.943495 -0.270551466484 0.157661524361
   50.946968 -0.0337026538435 -0.0137048781074
   50.950440 0.0858492592976 0.0797801873849
   50.953912 -0.0129616289374 0.0845223560892
   50.957384 0.0850834264062 0.102105093923
   50.960856 0.0764684619442 0.037916713034
   50.964329 0.0332957778643 0.105502209528
   50.967801 0.0444720374547 0.0880689415549
   50.971273 0.0676536042865 0.122560002226
   50.974745 0.0332088702738 0.0662496546626
   50.978218 0.0771203795957 0.0806097547039
   50.981690 0.0272211978969 0.077277779004
   50.985162 -0.0302091825155 -0.0200010394258
   50.988634 0.0310428114369 -0.0168059621616
   50.992106 -0.0026723589857 0.0122642560031
   50.995579 -0.0187176468322 -0.0111688675306
   50.999051 0.0458545108892 0.0507390950835
   51.002523 -0.0191823595294 -0.00458922979353
   51.005995 -0.0190612485402 0.0183893814591
   51.009468 0.0340372364947 -0.0194742491835
   51.012940 -0.0275409861545 -0.00924760915685
   51.016412 0.0138107497194 0.0079353244242
   51.019884 0.0346177883064 0.014335164291
   51.023356 -0.0134495815954 -0.0366590147149
   51.026829 -0.035030868703 0.03398854002
   51.030301 0.0356539005289 0.0114541290496
   51.033773 0.0162327117255 -0.00450516561281
   51.037234 -0.0223321973657 -0.0195416596938
   51.040706 -0.0220806590302 0.0211692318508
   51.044178 0.0420936689945 -0.00743630671283
   51.047650 -0.0405025678398 0.0221152301407
   51.051123 0.0392085869246 -0.00626527898585
   51.054595 -0.0281409846598 0.0937570588615
   51.058067 0.00614181758005 0.040135801509
   51.061539 0.0128123529765 -0.0227943600478
   51.065012 -0.0174203354517 0.0037197896415
   51.068484 0.0271470334503 -0.00923684443908
   51.071956 -0.0261088929172 0.0480173202833
   51.075428 -0.005021366145 -0.0390012495823
   51.078900 0.0228149610014 0.0107135979263
   51.082373 -0.0244233930747 0.00323878226689
   51.085845 0.0220427185562 0.0114031025585
   51.089317 -0.00107635500746 -0.0288335605123
   51.092789 0.0323554666333 0.0807324634268
   51.096262 -0.0118940090601 0.0489963464777
   51.099734 -0.00885428431781 -0.0175268247882
   51.103206 -0.00301174964542 0.010655439539
   51.106678 0.0120056241001 -0.0074527463158
   51.110150 -0.00903699580824 0.0933043655085
   51.113623 0.00533643444815 -0.0236495370588
   51.117095 0.00249100705715 0.0111987849644
   51.120567 0.00288243818089 0.0827867329673
   51.124039 0.0205499162745 -0.0298727160774
   51.127512 -0.0463044271532 -0.046130955634
   51.130984 0.0461584374934 0.0683299518353
   51.134456 -0.019036294988 0.0348965307193
   51.137928 0.038989387259 0.0626006278862
   51.141400 0.0303292644274 0.0714277236143
   51.144873 -0.0159528436412 0.0683591218009
   51.148345 0.0256728327295 -0.02630308542
   51.151817 -0.0159886760332 -0.00098891984222
   51.155289 -0.0504308193628 0.0887473638081
   51.158762 -0.349978680058 0.323739039876
   51.162234 -0.286247169672 0.274612925614
   51.165706 -0.110376331324 0.144144182981
   51.169178 -0.162568923935 0.136387393029
   51.172650 -0.141562613356 0.138319176334
   51.176123 -0.108277981663 0.115307628455
   51.179595 -0.0760723774193 0.0889731584886
   51.183067 -0.170743718928 0.145893430798
   51.186539 -0.138410288496 0.135530067819
   51.190012 -0.162206727055 0.148289809156
   51.193484 -0.0949298843342 0.115680218164
   51.196956 -0.160791315783 0.170632979506
   51.200428 -0.157879212863 0.141820327229
   51.203900 -0.0475937121663 0.0472729728776
   51.207373 -0.0534205624929 0.053533689302
   51.210845 -0.0636725022952 0.073776099562
   51.214317 -0.141270414545 0.118179432982
   51.217789 -0.142843349303 0.150465344237
   51.221262 -0.199828743738 0.0816392447941
   51.224734 -0.260475119669 0.15602134105
   51.228206 -0.364201126544 0.170263821902
   51.231678 -0.567003928381 -0.0525241713281
   51.235150 -0.573940241377 0.0558280264887
   51.238623 -0.598293684722 -0.00449579298742