dset fcst_202112/01/00/gefs.slp.nh.m01.29day.gr undef 9.999E+20 title gefsv12 29-d 6-h slp xdef 144 linear 0.000000 2.5 ydef 36 linear 2.5 2.5 tdef 116 linear 06z01dec2021 6hr zdef 1 linear 100000 20000 vars 1 slp 1 99 29-d 6-h slp (Pa) ENDVARS