Hi All, I added a file called BarrelEMcal_HDDS.xml_3x3 to the geometry directory HallD/src/programs/Simulation/hdds. it has a segmentation of 3x3 for the inner readout to allow studies with the alternative readout system. The readout segmentation currently implemented in BarrelEMcal_HDDS.xml for the inner part is 4x6. cheers, Beni