[Ifeffit] Fitting mechanism of Artemis

Dear all, I have a general question regarding the mechanism employed in the fitting procedures implemented in Artemis. How exactly is performed a fit? Do we have a fixed central atom (absorbing/emitting atom) and only the distances to the neighbors included in the probed pathways are varied, i.e. by varying the coordinates of the corresponding neighbor atoms, or during the fitting process Artemis can vary the position of the absorption center too? Could the procedure be constrained in such a way that the scattering pathways are adjusted by only varying the coordinates of the central atom? With kind regards, Konstantin Bikov PhD Student at the Physics Department of the University of Sofia, Bulgaria