"R.Bauer" wrote: > You should always use the /cell_fill keyword instead of /fill!!!! Ding ding! We have a winner! :) The bizzare part is that cell_fill does not appear in my online help, nor in my manual. I am using IDL 5.3, and cell_fill works perfectly, despite not being mentioned anywhere. It does slow the script down my about 15 seconds, but it's well worth it. Thank you! Simon