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Hi, has anybody compiled a SHELXL version with array sizes suitable for full matrix refinement of small proteins. I compiled a version with LM=3200000 JW=400000000 IM=200000 LU=4096 for a new quad core Xenon mac and the speeds I got were less impressive. At the same time the precompiled versions from the SHELXL website ran circles around my older Athlon boxes. My suspicion is that I did not use the best compiler or that I am not using the right optimizations, in particular, I have no idea what is the best value for LU. The instruction in the SHELXL header file indicate that one might have to play with this parameter... So if anybody has played around with this and made executable with a good compiler, I would love to get a copy. Thanks, Ulrich