Something happened between the last two b1pi test runs. https://halldweb1.jlab.org/b1pi/2012-06-21/Linux_RHEL5-i686-gcc4.1.2/ https://halldweb1.jlab.org/b1pi/2012-06-25/Linux_RHEL5-i686-gcc4.1.2/ It looks like a lot pi+'s are being mis'IDed as protons.