Hello Brandon, Good to hear from you. Tony had written an example some time ago to do just this. I'm including a slightly modified version of the class which can read in an sio file, process the events with an example processor and write out the histograms into an aida file which can be further analyzed with JAS3. It's not as clean as we'd like it to be, but it should allow you to proceed with your analysis. I'm appending the requisite setup to configure your system to compile and run. You'll have to modify the locations of your installation. Please let me know if you encounter any difficulties or have any further questions. By the way, we have set up a discussion forum to supplant this mailing list. Please visit http://forum.linearcollider.org and provide us with some feedback. Norman set JAS3LCD=c:\documents and settings\tonyj\.jas3\extensions set JAS3ROOT=c:\Program Files\jas3\lib set JAS3EXT=c:\Program Files\jas3\extensions set CLASSPATH=. set CLASSPATH=%CLASSPATH%;%JAS3ROOT%\freehep-base.jar set CLASSPATH=%CLASSPATH%;%JAS3ROOT%\jas3.jar set CLASSPATH=%CLASSPATH%;%JAS3ROOT%\openide-lookup.jar set CLASSPATH=%CLASSPATH%;%JAS3ROOT%\jdom.jar set CLASSPATH=%CLASSPATH%;%JAS3ROOT%\jas-plotter.jar set CLASSPATH=%CLASSPATH%;%JAS3EXT%\aida.jar set CLASSPATH=%CLASSPATH%;%JAS3EXT%\aida-dev.jar set CLASSPATH=%CLASSPATH%;%JAS3EXT%\freehep-hep.jar set CLASSPATH=%CLASSPATH%;%JAS3LCD%\jas3lcd.jar set CLASSPATH=%CLASSPATH%;%JAS3LCD%\lcd.jar javac StandaloneJas3SioAnalyzer.java java StandaloneJas3SioAnalyzer MyFile.sio -1