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Hi LCD Developers, I would like to encourage again the use of classes like SpacePoint/SpaceVector or HepVector. Let's look at the class Cluster. It has a method double[] getPosition(). aha. The javadoc says "Position of the cluster." Not very helpful, the method name already states that. Now, the problem here is: what does this return ? A three-dimensional cartesian vector ? A three-dimensional cylindrical vector ? A three-dimensional spherical vector ? Just the two spherical angles ? Because after all, the radius is fixed... The second problem is this: The cluster has a finite extension. How is this position defined ? The problem is that all of these things are obvious to the developers of the class, but I don't think this is obvious to our users. Please let's all try to make it easy on them. I am thinking primarily of graduate students like myself who may or may not know what they are doing. Thank you, Jan -- Jan Fridolf Strube University of Oregon Stanford Linear Accelerator Center mailstop 35 bldg 48, rm 244 phone: (650) 926-2913