Testing deblended 850 μm flux densities using AS2COSMOS. Top panel: Comparison between deblended 850 μm fluxes (red: XID+; blue: Jin et al. 2018) and ALMA 870 μm measurements. The solid line corresponds to the 1:1 ratio. The shaded region is within a factor of two from the 1:1 and the dashed lines are within a factor of 10. Bottom panel: probability distributions of the difference between the deblended fluxes and ALMA measurements normalised by the 1σ flux uncertainty, for sources with ALMA measured fluxes >4 mJy.