Hi Anatoly, Bruce, Carlo, Anatoly is right on the meaning of the "np > np1x" message. It would be trivial to increase this. There are 4 integer arrays and 1 double precision arrays with this dimension. Increasing this to 40000 would add less than a megabyte of memory. Anyone remember when adding a megabyte here or there was a legitimate concern? It would probably let you go beyond 7 Ang in nearly any structure. Since feff6l is intended for EXAFS analysis (and only EXAFS analysis), that seems perfectly reasonable to me. But: I think the real problem ist that feff6l stops completely with a cryptic Fatal Error message when it exceeds np1x paths (even Bruce couldn't decipher it!?!). Of course, it may have to stop enumerating paths at some point, but it should continue on to GENFMT if runs out of memory for the paths. I'll try to make both changes for the next release, and look for other silly 'Fatal Error' messages that could be warnings. --Matt