2     1
     NAM     5    12    19    12     0
    GFSG     5    12    19    12     0
     1 FORWARD  ISOBARIC
     5    12    19    12   46.000  -68.000  2500.0
     1 PRESSURE
     1     1     5    12    19    12     0     0     0.0   46.000  -68.000   2500.0    716.5
     1     1     5    12    19    13     0     1     1.0   46.086  -67.307   2510.6    716.6
     1     1     5    12    19    14     0     2     2.0   46.181  -66.628   2494.0    717.8
...
     1     2     5    12    22    22     0    82    82.0   67.683  -24.901   2450.0    732.7
     1     2     5    12    22    23     0    83    83.0   67.732  -25.188   2446.5    732.9
     1     2     5    12    23     0     0    84    84.0   67.796  -25.527   2439.8    733.2