[Ifeffit] Fitting using Experimental standard

A very happy new year to all Generally the fitting is done using theoretical standards. For that in Artemis, we give input as crystallographic data. But If we want to use an experimental standard instead of theoretical standard, how that can be done. Is it possible to use experimental standard in Artemis? or we have to use some other method. with thanks Abhijeet Gaur School of Studies in Physics Vikram University, Ujjain (India)