Hi Everyone, I wonder if you have seen the online electron-photon shower tool at http://www2.slac.stanford.edu/vvc/egs/advtool.html? Ralph Nelson and I came up with this about ten years ago as part of the online SLAC virtual visitors center. It runs EGS showers for various media with selectable energies and magetic field strength, then displays the result as a gif file. It's been used as a teaching tool in a number of radiation physics courses. I mention it because we just moved it to a newer server today and that reminded me about it. Thanks, --Ray