Hi Bernard, thanks for your very thorough explanation. I guess i'm trying to find out why this was done at los Alamos labs and why it was framed. this link shows exactly what I've got (but on blueprint paper) http://www.plmworld.org/p/cm/ld/fid=237
as is mentioned on the unigraphics site, the image was created at los Alamos and used to test plotters. i'm waiting to hear back from a few more experts in this area but i'm thinking perhaps mine is a hard copy of the original unigraphics image. fascinating.