[Ifeffit] Artemis

Hi people!! I was fitting with Artemis bimetallic catalysts with two different structures: platinum structure plus an intermetallic compound structure. As I only use a small range of R space (1st shell) for fitting, I have a small number of independents points and I used an appropriate number of variables. The question is: I used the same values of SO2, delR, sigma^2 and deltaE0 for both structures, is that ok? or maybe I have to increase until 8 the number of variables? Thank you very much Best regards, JA