Testing deblended 850 μm flux densities using A3COSMOS. Top left: comparison between deblended 850 μm flux and ALMA 870 μm photometry from the blind ALMA catalogue (red: XID+ deblended fluxes; blue: super-deblended fluxes from Jin et al. 2018). The blue vertical dotted line corresponds to the rms noise level of S2CLS-COSMOS. Top right: similar to the top left panel but for comparison with the ALMA prior photometry measurements. Bottom left: normalised distributions of flux difference (between deblended fluxes and ALMA blind photometry) divided by the 1σ flux uncertainty, for sources with ALMA measured fluxes >4 mJy. The vertical dotted line corresponds to no difference between the deblended flux and the ALMA flux. Bottom right: similar to the bottom left panel but for comparison with the ALMA prior photometry catalogue.