Hi @singularity91 @olibclarke,
The FSC is always computed over wavelengths ranging the whole Fourier spectrum of the volume, and volumes aren’t downsampled. The log printout is meant to be used for debugging, but the meaning is a bit ambiguous.
To clarify what it means: the “downsampled” size here relates to how the masks are applied to the volume. Each FSC curve plot in a normal job shows various FSC curves with different masks applied. It’s expensive to store each mask to the full box size, so masks are computed at the “downsampled box size” and then multiplied by the (full size) volume with interpolation as needed.
Best,
Michael