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Figure 5
Fraction of per-iteration wall-clock time spent on reprojection estimation. Percentage of per-iteration wall-clock time attributed to reprojection estimation for the volume-based (solid) and volume-free (dashed) approaches. Reprojection estimation corresponds to 3D Fourier gridding and volume reprojection in the volume-based approach, and to direct estimation in the polar Fourier domain in the volume-free approach. (a) Msp1. (b) ApoF.

IUCrJ
Volume 13| Part 4| July 2026|
ISSN: 2052-2525
https://doi.org/10.1107/S2052252526003611