Comparison of the sky (10′ × 10′ cutouts) at different wavelengths. Top row: the same patch of the sky from 24 μm to 500 μm from the real observations (top). Bottom row: similar to the top row but for the SIDES simulation including Gaussian random noise. The simulation can statistically reproduce the observed far-IR and sub-mm sky reasonably well. One can also notice that the PACS 100 and 160 μm maps are much more dominated by instrument noise compared to the maps at other wavelengths.