Fig. 5.

Plot of the weighting function W that takes into account the overlap of the two pseudo-Friedel-related components at lower resolution. There is no overlap for Fourier spacings where ΔF > Dd/2λ, so $W=1.0$ beyond that. At very low resolution, where the two components are largely overlapped, the value of W is equivalent to that of a conventional CTF. The defocus ΔF and the particle size D control the bandwidth of the transition at a given energy, here 300 keV ($\lambda =0.02$ Å).