dset ^lpw%y4_L3_mon.grd undef -999.9 title NVAP Layerd Water vapor Jan 1988 options template yrev *format yrev XDEF 144 LINEAR 1.25 2.5 YDEF 72 LINEAR -88.75 2.5 zdef 1 levels 500-300 tdef 144 linear 12Z01JAN1988 1mon vars 1 lpw3 1 212,8,0 total precipitable water (g/kg) endvars