Example of completeness analysis in the case of G202.02+2.85. Upper panel: surface brightness map of G202.02+2.85 in the 250 μm band for the true observations (left) and after adding isothermal Bonnor-Ebert sources (right). Lower panel: the black line histogram shows the mass spectrum of the added Bonnor-Ebert sources. The grey histogram represents the mass spectrum of the sources detected by getsources. The red points are the bin-by-bin ratio of the two histograms with statistical error bars defined by 1/ with N the number of injected sources. The red solid line is a tanh fit of the red points. The blue and purple dashed lines emphasise the completeness values at 90% and 50%, respectively.