Hi Luanga, Artemis/Ifeffit allow both the third and fourth cumulants to be fitting parameters. Assigning a guess parameter to the third cumulant, particularly for near neighbor paths, can sometimes be quite useful. A fit that requires cumulants beyond the fourth is usually so disordered that a cumulant expansion isn't the best strategy anyway. --Scott Calvin Sarah Lawrence College On Dec 26, 2007, at 6:12 PM, Luanga Nchari wrote:

Merry Christmas to all. I am a research student with the following questions: · Does Artemis have a cumulant expansion feature? How can it be used to correct anharmonicity? I suspect this might answer why my fit in K-space is not quite in phase eventhough the fit in R-space is good. Other suggestions would be welcome. Thanks, Luanga Nchari

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