ORIGIN: top left
0 0 TNL GRID FILE XXX*
1 0 TNL GRID FILE
0x30 8-> ymin (°) (Min Latitude in decimal degrees)
0x38 8-> ymax (°) (Max Latitude in decimal degrees)
0x40 8-> xmin (°) (Min Longitude in decimal degrees)
0x48 8-> xmax (°) (Max Longitude in decimal degrees)
0x50 8-> dy (°)    (Step size for latitudes, in decimal degrees)
0x58 8-> dx (°)  (Step size for longitudes, in decimal degrees)
0x60 4->  (vNY, nrows)
0x64 4->  (vNX, ncols)
       North Pole
       South Pole
       Missing Value (nodata)
       Scale
       Flags*
0x92+ data*