Yuan, It seems unwise to post a new question at the end of a long and active thread. Presumably you are looking for an answer -- hiding your question at the end of another thread does not seem like a good way to get that answer. That said, the answer to the question of how to get more than 512 paths depends on your operating system. For Mac: See http://millenia.cars.aps.anl.gov/pipermail/ifeffit/2010-October/009673.html For Windows: You will need the ifeffit dll compiled with more paths. Matt, does such a thing exist for the current version of the dll? If you are using linux, let us know. It is not hard to recompile everything to do what you need. I can write up a short howto. B -- Bruce Ravel ------------------------------------ bravel@bnl.gov National Institute of Standards and Technology Synchrotron Methods Group at NSLS --- Beamlines U7A, X24A, X23A2 Building 535A Upton NY, 11973 My homepage: http://xafs.org/BruceRavel EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/