Hello, I downloaded and compiled GEMPAK 5.6.e.1 tonight and tried my zonal wind plot of global thinned AVN data and continue to get the same results as reported http://www.unidata.ucar.edu/glimpse/gempak/4652 http://www.unidata.ucar.edu/glimpse/gempak/4647 I am running on RH Linux 7.1 (2.4.9-6SGI_XFS_PR4smp) I tried to replicate the behavior on a IRIX box, but I get bus errors with a core dump. The IRIX box is running 5.6.c.1 Idears? Thanks, Daryl -- /** * Daryl Herzmann (address@hidden) * Program Assistant -- Iowa Environmental Mesonet * http://mesonet.agron.iastate.edu */