### Link between pixel size and largest spatial frequency

The largest sampled spatial frequency is directly linked to the synthesized beam size (i.e. the interferometer spatial resolution). The pixel size must be at least 1/2 the synthesized beam size to ensure Nyquist sampling in the image plane. However, Nyquist sampling is enough only when dealing with linear process while deconvolution techniques are non-linear process. We thus recommend to pick a pixel size between 1/3 and 1/4 of the synthesized beam to ease the deconvolution. Unless you have good reasons, you should not choose too large an image size nor too small a pixel size at least because it would considerably slow down any deconvolution algorithm.