[Ifeffit] Artemis fitting problem

Hi every one, Actually I want to know that is it necessary to fit Ei, 3rd, 4th, cumulant in the fitting procedure .If yes then please tell me how to get them involve in the fit .when I give parameter like guess 3rd, guess 4th . Artemis dont take them . One more thing is that I am fitting Cu foil, CuO and Cu2O , so how many number of paths should I take . Abhijeet