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Figure 1
Example square, hole and highest-magnification exposure. Windows in the cryoEM grid containing ice are known as `squares'. Within squares are circular `holes'. Highest-magnification exposures are taken within holes. Ideal highest-magnification exposures contain particles (as shown) and have thin ice.

IUCrJ
Volume 10| Part 1| January 2023| Pages 90-102
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522010612