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Figure 12
Differences in EDD at the O(9) anion in a range of pressure values from ambient to 40 GPa described by a set of isovalues. The regions in space which carry more total electron density (defined by the isosurface value) at ambient pressure than under particular pressure values are in blue and the regions for which there are more total electron density (as defined by the isocontour value) under pressure than at ambient pressure are in red. So we can interpret such figures as an illustration of the redistribution of charge (at a given contour isosurface value) from the blue regions at ambient pressure to the red regions under higher pressure values.

IUCrJ
Volume 9| Part 1| January 2022| Pages 146-162
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521012628