Modifying the initial model before refinement starts.Default refinement with user specified X-ray target function.Bulk solvent correction and anisotropic scaling.Setting the resolution range for the refinement.Creating R-free flags (if not present in the input reflection files).Changing the number of refinement cycles and minimizer iterations.Examples of frequently used refinement protocols, common problems.Refinement at high resolution (higher than approx.Neutron and joint X-ray and neutron refinement.Refinement of Atomic Displacement Parameters (ADP or B-factors).Giving parameters on the command line or in files.Remark on using amplitudes (Fobs) vs intensities (Iobs).Citation reference and comprehensive methodology details.
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