DSET ^globalmask0.5.dat OPTIONS big_endian UNDEF -999.0 TITLE Land portion XDEF 720 LINEAR 0.25 0.5 YDEF 360 LINEAR -89.75 0.5 ZDEF 2 LEVELS 1 2 TDEF 1 LINEAR JAN1948 1mo VARS 1 mask 1 99 elevation in m ENDVARS