>> Do you have a image of the Coombs photo you can send? Printed book, copyrighted material... The arc shows very well on the _southeast_ side of the cluster (my error) on the DSS1 scan of the cluster. Using the Goddard SkyView utility, it shows nicely if you get the DSS1 image with a 0.2-deg field. http://skyview.gsfc.nasa.gov/cgi-bin/skvadvanced.pl \Brian -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.