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To compute the fragment density difference you must first define the fragments. You will do this using the Edit Sets option. Begin by creating a set containing the carbon and oxygen atoms.
      Select Edit | Edit Sets from the menu bar to open the Edit Sets dialog. Click on the carbon atom to select it. Hold down the SHIFT key and click on the oxygen atom. On the Edit Sets dialog, click the New... button to open the Define New Set dialog. Enter the name DensityDifference, click the OK button and close the dialog.
     In order for CASTEP to recognize the set as a fragment for charge density difference calculations, the name must contain the text string DensityDifference.
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