4500    'idm   ' = longitudinal array size
 3298    'jdm   ' = latitudinal  array size
   12    'mapflg' = map flag (0=mercator,10=panam,12=ulon-panam)
plon:  min,max =        74.12003      434.11996
plat:  min,max =       -78.64000       89.97772
qlon:  min,max =        74.12000      434.12000
qlat:  min,max =       -78.65600       90.00000
ulon:  min,max =        74.12000      434.11993
ulat:  min,max =       -78.64000       89.98425
vlon:  min,max =        74.12006      434.12000
vlat:  min,max =       -78.65600       89.98425
pang:  min,max =        -2.67795        2.67795
pscx:  min,max =      1752.19214     8896.78809
pscy:  min,max =       100.00000     8895.59277
qscx:  min,max =       100.00000     8896.78516
qscy:  min,max =       100.00000     8895.59277
uscx:  min,max =       100.00000     8896.78809
uscy:  min,max =       100.00000     8895.59277
vscx:  min,max =      1749.75659     8896.78516
vscy:  min,max =       100.00000     8895.59277
cori:  min,max =   -0.0001429933   0.0001458425
pasp:  min,max =         0.49243       60.65120