DSET ^ntc.grd OPTIONS LITTLE_ENDIAN UNDEF 3e33 XDEF 720 LINEAR 0.250 0.500 YDEF 360 LINEAR -89.750 0.500 ZDEF 1 LINEAR 0 1 TDEF 160 LINEAR 15MAR1851 1YR VARS 1 ntc 0 99 tropical cyclone within 160km [1] ENDVARS