Hi. I am testing the efficiency of the first guess code for fields of 1.2T vs. 2.2T. The two geant runs were identical with the exception of the magnetic field. I turned on most of the available physics with the following settings. However, I did not track secondaries. I will run again after making the necessary changes to track secondaries. DCAY 1 ANNI 0 COMP 1 PAIR 1 BREM 1 PHOT 1 MUNU 1 LOSS 2 MULS 2 The attached plots show efficiency for finding the track at the resolution of wire centers vs. cos(theta) in reduced energy bins. The full field (2.2T) is plotted in red, the 1.2T field is plotted in blue, as noted. Jim