Tony, I've managed to build and Pandora_Pythia on a Solaris box at SLAC w/ very minor modifications to Masako's instructions. I'm now trying to read in and analyze the generated events in JAS through the output STDHEP file, but I get the following exception java.lang.ArrayIndexOutOfBoundsException: 4000 at jasext.hepevt.HepEvent$HepEnumeration.nextParticle at hep.lcd.util.driver.LCDHepEvent$MCHepParticle.getDaughters ... It happens on 97/100 events that I generated w/ the following gen_eetottbar output.dat 100 > output.list from the examples. The Pandora_Pythia output summary looks fine (see below), and STDHEP doesn't complain, i.e. ******************************************************** * STDHEP version 4.07 - July 14, 1999 * ******************************************************** STDXWOPEN WARNING: I/O is initialized for stdhep only STDXEND: 513431 words i/o with 10012 efficiency Mike The value of the integral is 739.999 pm 11.8396 and the maximum weight found is 21772.2 ... ====================================== Welcome to pandora_pythia. ====================================== -------------------------------------- Cross section = 738.543190 ... Event listing (summary) I particle/jet KS KF orig p_x p_y p_z E m 1 !e-! 21 11 0 0.000 0.000 250.000 250.000 0.001 2 !e+! 21 -11 0 0.000 0.000 -250.000 250.000 0.001 3 !gamma! 21 22 0 0.000 0.000 0.252 0.252 0.000 4 !gamma! 21 22 0 0.000 0.000 -0.525 0.525 0.000 5 !phasespa! 21 83 0 0.021 -0.040 0.240 499.223 499.223 6 !t! 21 6 5 101.195 130.398 -21.348 242.648 176.574 7 !tbar! 21 -6 5 -101.195 -130.398 21.621 256.575 195.241