dset ^drymask3.bin
options  little_endian 
title Dry mask 3-month time scale (r < 0.5 mm day-1) 
undef -999.0
xdef 1440 linear     0.12500000 0.25000000 
YDEF  720 LINEAR -89.875 0.25    
zdef 1   linear 1 1
tdef 12 linear jan2001 1mo
vars 1
dm     1  00 dry mask
ENDVARS