Motivated by the plots shown by Philippe in the last beam test VRVS meeting on the distribution of CalZDir (see ) I spent some time inspecting the reconstruction of the direction of muons (which is far simpler than electrons) in the calorimeter of the calibration unit. In this page you find a comparison of the FRED event displays and also the distributions of Trk1ZDir and CalZDir for muon events detected with the calibration unit (Pisa, July 2006) and with the full LAT detector (SLAC, April-May 2006).
Muon Data from Pisa
Muon Data from CERN
David please include run numbers
Electrons @ 5 GeV
David please include run numbers