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. Author manuscript; available in PMC: 2010 Mar 23.
Published in final edited form as: Q Rev Biophys. 2009 Aug;42(3):139–158. doi: 10.1017/S0033583509990059

Fig. 2.

Fig. 2

Averaging of 40S subunits from HeLa cell ribosomes. (a) Electron micrograph of negatively stained subunits, with “L” denoting left-facing views selected for alignment and averaging. (b, c) Averages of halfsets of 40 particles each; (d) variance map; (e) total average; (f) three measures of resolution: R, R factor; Δ, Euclidean distance; δϕ, DPR indicating a resolution of 20 Å at 45°. Data reproduced from Frank et al. (1981b); panels R and Δ in (f) are from unpublished data.