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 Scenario B : Centrosymmetric space group - CCP4 available.

Unfortunately, the current version of the program sftools (from the CCP4) refuses to cooperate if the space group is centrosymmetric. The result is that GraphEnt's GUI will not work. The way to proceed is to use CAD to select the columns you need for the calculation. Using the program in this mode is described in detail in section 6.3.

NMG, Nov 2002