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Figure 4
Fitting the even terms of the CTF to focal series of graphene oxide. (a)–(c) Preparation of a micrograph of graphene oxide for fitting the CTF. (a) Background. (b) Envelope. (c) Background subtracted and divided by the envelope. The CTF fit was limited to 2.5 Å to exclude the 2.13 Å reflections from the graphene lattice. (d) Fitting for an untilted beam. (e) Fitting for a beam tilted about 7.4 mrad. Three of the 20 modified power spectra in each series are shown in (d) and (e) in the left half with the fitted CTF in the right half.

IUCrJ
Volume 13| Part 1| January 2026| Pages 77-93
ISSN: 2052-2525
https://doi.org/10.1107/S2052252525010796