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Figure 4
The difference map (data − model) is calculated for the pixels inside the filters shown in Fig. 3[link]. It is calibrated by the local mean-square deviation in order to allow comparison between pixels. Here a vertical mis-setting appears clearly. Its origin is a small error in the centre position. Using non-centred functions (with the centre coordinates as variables) instead of the centred ones allowed an excellent fit to be obtained.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 40| Part s1| April 2007| Pages s433-s438
doi:10.1107/S0021889807009314
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