dx7 stream description file for gx1v4 SSMI iFrac data uses gx1v3 data -- this is OK because v4 is a subset of v3 in polar regions SSMI ifrac ifrac domain.ocn.gx1v4.060403.nc time xc yc area mask ssmi_ifrac.clim.gx1v3.060706.nc cp:/fis/cgd/cseg/csm/inputdata/ice/dice7/SSMI