Many thanks for all the suggestions, and apologies for my slow response.
First step - I'll update SunStudio. Currently on version 8..... Then I'll have another go from scratch and use the cookbook John pointed out. Hopefully all will then be well and you'll hear no more from me on this
Thanks again -- Sheila -------------------------------------------------------------------------- Dr. Sheila Bryant Software Applications Support Email: [EMAIL PROTECTED] Dept. of Meteorology, Phone: 0118 378 6395 University of Reading, --------------------------------------------------------------------------