FEFF has been extensively tested on many platforms but occasionally new bugs show up, e.g., on new operating systems or machines. In an effort to maintain portable and trouble-free codes we take all bug reports seriously. Often we receive reports by users of older versions of FEFF of bugs that have been fixed in the latest releases. Other code failures can often be traced to input file errors, sometimes quite subtle.

If you encounter any difficulties either compiling or running the code, please e-mail us a bug report, including the feff.inp input file used, the machine and compiler you are using, and a summary or listing of the error messages or other output that shows what the problem is. Please see Appendix F of the document for more details.

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