Dear cal group, I have posted GlueX-doc-1214 on estimating the performance gains for SiPMs when they are cooled. I can go over the note briefly at our meeting this morning. Cheers, Elton. Elton Smith Jefferson Lab MS 12H5 12000 Jefferson Ave Suite # 16 Newport News, VA 23606 elton@jlab.org (757) 269-7625 (757) 269-6331 fax