The histogram for a correctly phased protein with a given percent solvent and resolution range is characteristic. Any deviations are due to phase errors. By comparing your phase set with those of other well-refined proteins in the same resolution range, you can guess the amount of phase error. The histograms can be saved and loaded in the File window. File Pop-up Window has several options, as described below.
Directory tells where to find the data files.
List lists the files matching the displayed filename filter. Map File shows the currently selected input map file. If it exists, then it is used to determine the protein and solvent regions of the unit cell. Only, or Solvent Points Full Scale. Histogram specifies the filename of an .edh file to save the histogram information.