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Figure 5
The mean and dispersion images for 4puc (a, b), 4ef1 (c, d) and 4kw2 (e, f). The mean image is the mean value at each pixel through the image stack; the index of dispersion image shows the variation across the data set at each pixel. In the mean image the ice rings are clearly visible. The dispersion images also show the structure of the detector. The boundaries between the detector chips are visible as lines of pixels that are under-dispersed relative to a Poisson distribution. This is owing to the use of virtual pixels between chips that share counts and whose values are therefore correlated.

IUCrJ
Volume 4| Part 5| September 2017| Pages 626-638
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517010259