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Figure 3
Heat maps for coma and trefoil values refined separately per image from the HemQ-57K data set. The leftmost panel shows tight clustering of the coma values, with the center panel magnifying the region of clustering. The right panel shows the values of trefoil, which for this data set were very low and very consistent across the entire data collection. Dividing coma expressed in micrometres by a factor of 8.1 converts it to the equivalent mrad beam-tilt units assuming Cs = 2.7 mm.

IUCrJ
Volume 7| Part 3| May 2020| Pages 445-452
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520002444