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Hi, I have committed a change to lcsim so that the ECAL top and bottom beam gap sizes can be set in the compact.xml file. See this resolved JIRA item https://jira.slac.stanford.edu/browse/HPSJAVA-388 The parameters are set like <layout beamgapBottom="40.0*mm" beamgapTop="20.0*mm" ... > See this file for a complete example lcsim/trunk/detector-framework/src/test/resources/org/lcsim/geometry/subdetector/HPSEcal3Test.xml And you can test this with cd lcsim/trunk/detector-framework; mvn test -Dtest=HPSEcal3Test I verified that it looks right in the output Heprep file in JAS3 and also in the Geant4 visualization, where I saw the top and bottom gaps had different sizes from the parameters. You will probably want to verify this separately anyways as a crosscheck, if you plan to use this for reconstruction or simulation. This doesn't solve the problem of being able to align the ECAL in all generality. That is a lot more complex to implement and will require writing a new detector model that is structured differently than the current one. (I added a JIRA item for this, but I don't know when we will be able to do it!) --Jeremy ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1