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Thanks. The alias and file template is correct, but I am getting an error with GFUNC = ENS_PROB(gt(prec,2)) which I think is due to the missing PREC grid in ens_2010120505_03.gem in GDINFO, _01.gem and _02.gem have grids PREC and CREF, but _03.gem only has CREF. so the error I see is: [DE 4] Number of MEMBERS = 3 [DG -7] Input grid GT(PREC,2) cannot be found. [DE -9] Ensemble diagnostic cannot be computed. [DG -70] Ensemble field cannot be computed. [GDPLOT 2] The requested scalar/vector cannot be computed. I believe that all would be okay if _03.gem had PREC available. However, the fact that you are still seeing "Grid file or template does not exist" suggests to me that the routines handling ensemble grids in 5.10 are outdated and you need to upgrade. 6.8 is the latest stable version, but you will need to build from source on OS X until I can put out a Mac binary/dmg package. -Michael Ticket Details =================== Ticket ID: NVD-552590 Department: Support GEMPAK Priority: Normal Status: Open