Figure 3. Resolution of the reconstructed volume: The PTRF (I_{reconstructed}/I_measured) as a function of the spatial frequency.

Also displayed are the theoretical MTF with 70% efficiency for Abbé resolutions equal to 55 and 70 nm. The measured PTRF falls between these values, indicating resolution of better than 70 nm in the image. The reconstructed image was taken as a maximum intensity projection through the 3D volume and was compared to diffraction data from the same rotation angle. At low spatial frequencies, the beamstop on the zone plate masks the diffraction data and was therefore not included.