Craig Markwardt wrote: > Your example doesn't have the artifact on Linux on IDL 5.2 and IDL > 5.3. It sounds like a bug under HP-UX. I get the artifacts with IDL 5.0 to 5.2 on Sparc Solaris, but not with IDL 5.3 and Windows. Alex -- Alex Schuster Wonko@weird.cologne.de PGP Key available alex@pet.mpin-koeln.mpg.de