[phenixbb] anomalous difference map calculation

Hi, I am in the last refinement steps of a MR model and I want to calculate an anomalous difference map essentially to confirm the presence of a sulfite molecule and to locate vanadium (present in soaking solution). I read that it is necessary to have a mtz file with anomalous data (i.e. F+,F- or I+,I-). However, my data was collected at “normal” wavelenght (0.97) and it was processed with XDS considering Friedls law= true and my mtz file contain the following columns: H K L FP SIGFP. So, can I still calculate a anomalous difference map based on my data? Since I also have a Mo atom in the active site can I try to refine its occupancy by using the option “anomalous groups” in the refinement strategy? Thank you very much, Alexandra