Hello, I was wondering what the units for coordinate calls are I noticed that if I do a: EM_Barrel emb = ((EM_Barrel) detect.getComponent("EM_Barrel")); System.out.println( emb.getInnerRadius() + " " + emb.getZOuter() ); I get the following output: 127.07 184.0 While if I do a: MCParticle part = (MCParticle) penum.nextElement(); part = (MCParticle) penum.nextElement(); endpoint = part.getCalorimeterEntry(); radius = Math.round( (float)Math.sqrt( endpoint[0]*endpoint[0] + endpoint[1]*endpoint[1] )); zdist = endpoint[2]; System.out.println( radius + " " + zdist ); I get: 1270.0 1541.9126851377366 which I assume is a difference in metric units. Which one should I follow? Specifically when using these to find a calorimeter cell ID. Thanks, Brandon Drummond