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We should also think about changing the Large EM segmentation. It is also too big. The segmentations are done as follows: the entire cos(theta) and phi ranges are divided by a number of segments for each calorimeter type. For the Small, both are 300 segments EM, 100 HAD. Ditto for Large. So, for Small with a calorimeter inner radius of 75 cm, the phi segmentation is 2*pi/300 * 75 ~ 1.5 cm (hence Jim's request to reduce it). For the Large, it is almost 3 times as big since r ~ 200 cm, so about 4.5 cm. This is also too large for EM showers. Richard -- Richard Dubois SLD, Stanford Linear Accelerator Center [log in to unmask] http://www.slac.stanford.edu/~richard/ 650-926-3824 650-926-2923 (FAX)