To clarify: the last question was specifically related to the use of the EventHandler (EventAnalyzer) "histogram" method. I know how to declare the Histogram subclass Histogram1D hist1 = new Histogram1D("Catchy title"); in the processor class (outside of the process() and analysis methods, correct?), and then use hist1.getMean(); in my analysis method. However since I build the histogram titles and set the folders in the code loops (e.g. for different particle types, detector simulations etc.), the histogram method is very handy. I tried to use something like hist1.rename("A more useful locally built name "+particle_ID); but it grumbled at compile time about catching RenameExceptions. Perhaps histogram just cannot in the way I want? (If not, could it be upgraded?) It looks like histogram returns a Histogram object that doesn't like to be cast to a Histogram1D object... Any help will be appreciated. Bob -- Robert J. Wilson Professor of Physics Department of Physics Colorado State University Fort Collins, CO 80523 Phone: (970) 491 5033 Fax: (970) 491 7947 Email: [log in to unmask] August 2000 - July 2001: ======================== Institut de Fisica d'Altes Energies Universitat Autonoma de Barcelona E-08193 Bellaterra (Barcelona) SPAIN Phone: (011 34) 93 581.33.22 Fax: (011 34) 93 581.19.38 Email: [log in to unmask] ========================