HI Rafael, Visually the difference between collimator apertures is very small, although the central peak does seem to decrease somewhat with increasing diameter. It might be helpful to give a fitted sigma to each distribution to have a quantitative comparison between settings. Still, I assume the conclusion is that we can use the 2.6 mm collimator? Cheers, Elton. Elton Smith Jefferson Lab elton@jlab.org (757) 269-7625 On Wed, 28 Jun 2006, Rafael Hakobyan wrote:Dear All, Please, find the time distribution on the web site http://sisyphus.phys.uregina.ca/~rafael/BCal/MC/beamtest/19_06_2006/ Best regards, Rafael David Lawrence wrote:Hi folks, I've decided to try and start writing up minutes of the software meetings again. Find the minutes of today's meeting at: http://www.jlab.org/~davidl/HallD/Minutes/Software_2006_06_26 Regards, -David