Prior samples from the multifrequency sky model in Eq. (13). Each panel shows one realization of the sky brightness across three frequency channels (columns), with N_ps = 1000 point sources and N_es = 3 extended sources. The samples illustrate the interplay between diffuse, point-like, and extended components, all drawn independently from their respective priors. Each image is rendered as an RGB composite using three selected frequency bands, with intensity displayed on a logarithmic scale to enhance the visibility of both faint and bright features.