DIFF_patterson

When this keyword is present, GraphEnt expects to read 7 (and only 7) columns for each reflection record, which will be interpreted as h, k, l,| F₁|,(| F₁|),| F₂|,(| F₂|) for a difference Patterson calculation. The difference and its standard deviation will be calculated, the resulting data will be squared and the phases set to zero before the calculation is started.