Hi Rene, Many thanks for your help yesterday. I am now able to chain over several files. I do have a few more questions: 1. When I load with the ++ option (using the root interpreter), it takes 0.5 ms per event. Would is be faster still if I had a standalone program or is this as good as it gets? My student uses PAW (!) and, runnning over the same data set takes him 3 hours, while for me it will be 11 hours. Does this make sense to you? 2. Given the above, it might be worthwhile for me to make a reduced data set containing only a fraction of the events. Do you have an example of how to do this? Again, many thanks! Peter Peter Fisher Office 617-253-8561 Professor of Physics Fax 617-253-4100 44-118 MIT email fisherp@mit.edu Cambridge, MA, 02139
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