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Figure 2
Illustration of the effect of ice rings on the background determination when a simple plane model is employed. The shaded rectangles indicate the background pixels used to estimate the background. When the reflection is centred on the tail of the ice ring (a) the background is overestimated. When the reflection is centred on the peak of the ice ring (b) the background is underestimated.

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