Thanks Frank. I appreciate your comments.
I've recently added a fourth file which is the URV with Ramsay concealment.
By the way, if anyone has problems viewing the images I can send you one or more via email if you prefer. They are 1.5-2.5 MB files. Sometimes the server at Yahoo is busy and you'll get a 999 error. In some cases you may not have your computer configured with the latest Windows Media Viewer. Sometimes it's bad computer karma. :) If you can't get it to work, it may work by me emailing you the file. Email me at: firstname.lastname@example.org