Why bother using DIFABS Analysis?"You can use DIFABS in test mode at any stage, and it quite simple tells you if there is a systematic trend to the residual as a function of orientation. If the plot is fairly monochrome, then the residuals are not peaking up. If there are bright patches, it means that there is a systematic trend to the residual. Either FO or Fc is systematically wrong. Possible reasons are:
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To use DIFABS for diagnosis of your structure, from the main menu
use Analysis, Difabs analysis
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Output from an inorganic Cesium Titanium Silicate after the final
stages of refinement
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