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Figure 7
Higher-order aberrations measured on the high-resolution mouse apoferritin data set. The antisymmetrical plot (left) shows a significant trefoil aberration, while the symmetrical plot (right) shows a faint fourfold astigmatism. Although the aberrations are comparatively weak, they are clearly measurable and considering them does lead to a small improvement in resolution (see Fig. 9[link]). The dashed circle indicates a resolution of 1.04 Å.

IUCrJ
Volume 7| Part 2| March 2020| Pages 253-267
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520000081