dset ^drymask24.bin
options  little_endian 
title Dry mask 24-month time scale (r < 0.5 mm day-1) 
undef -999.0
xdef 720 linear   0.25 0.50
ydef 360 linear -89.75 0.50
zdef 1   linear 1 1
tdef 1 linear jan1980 1mo
vars 1
dm     1  00 dry mask
ENDVARS