Fig. 5. Assessment of the effective resolution of the map. The Fourier shell correlation coefficient is plotted against Fourier spacing for the map corrected for the contrast transfer function including the envelope function K_s (red trace) and ignoring the envelope function K_s (blue trace). The average values of the squares of the contrast transfer functions (including K_s) for all 10 micrographs are shown as grey, solid trace. The significance level 3σ for the Fourier shell correlation coefficient is plotted as a dotted grey line.