[phenixbb] fix atoms during refinement

Dear All Phenix Users, Is there a way to fix certain atoms position during refinement? I have some heavy atoms identified with MR-SAD, but when I build the whole molecule and have phenix to refine its position, the heavy atom's position is shifted from the anomalous signal. Therefore I would like to have these heavy atoms positions fixed during refinement. Thanks! Charles -- *************************************************** Charles Chen Research Associate University of Pittsburgh School of Medicine Department of Anesthesiology ******************************************************