I have not been able to get rid of all of the data holes since they are assigned as RMISSD for missing data (-9999.00), but I think I have solved the issue with different/missing PV values based on levels interpolated with GDVINT. I will send along the updates tomorrow morning for you to check with your data files. This and fiddling with the PMAX value should get you close to full coverage with as few interpolation holes as possible. -Michael Ticket Details =================== Ticket ID: RJR-299468 Department: Support GEMPAK Priority: Normal Status: Open