#   yearbase = 2018
#    refuv_inputfile='a_ex.gps',
#    refuv_source='nav',
#    ens_len=120,
#    bl_half_width=3,
#    pgmin=50,
#    rl_startbin=2,
#    rl_endbin=20
   76.889687        1e+38        1e+38
   76.891076        1e+38        1e+38
   76.892465 4.22906581113 2.37658219362
   76.893854 4.23386115172 2.26389655108
   76.895243 4.17296866163 2.49664946124
   76.896632 3.66378512764 2.11912210808
   76.898021 1.95007492341 1.09930920352
   76.899410 1.12162556979 0.553615645933
   76.900799 0.725849663658 0.403276157281
   76.902187 0.456338211887 0.175482969106
   76.903576 0.246990067636 0.10051422483
   76.904965 0.126250016362 0.121078990535
   76.906354 0.0545736974461 0.168020882583
   76.907743 -0.0375615890922 0.214982212974
   76.909132 -0.0613952122304 0.242991493435
   76.910521 -0.0911436449356 0.273132731516
   76.911910 -0.0933304271933 0.274128583233
   76.913299 -0.115210724079 0.249277360362
   76.914687 -0.0988105383035 0.286115474714
   76.916076 -0.131545882226 0.252236494333
   76.917465 -0.149104177568 0.247294019669
   76.918854 -0.118417810795 0.267659359731
   76.920243 -0.14209973705 0.254060274322
   76.921632 -0.143677383718 0.27460687243
   76.923021 -0.149635739561 0.301214253023
   76.924410 -0.154501218471 0.288993476686
   76.925799 -0.16850501412 0.28953525342
   76.927188 -0.131516733502 0.294941148176
   76.928576 -0.148686246658 0.288339562678