Global quarter degree with 17 bands, size (720, 1440, 17).
Band frequencies: 10.85, 10.85, 10.85, 10.85, 18.85, 18.85, 18.85, 18.85,
                   23.8 , 36.75, 36.75, 36.75, 36.75, 37.3 , 37.3 , 89.  ,
                   89. 
Band polarization: b'v', b'h', b'3', b'4', b'v', b'h', b'3', b'4', b'v',
                   b'v', b'h', b'3', b'4', b'v', b'h', b'v', b'h'

HHMM files: 2-byte integer