Differential number counts of red Herschel sources. The black diamonds are the measurements from Asboth et al. (2016). The red point is the result of an end-to-end analysis of our 2 deg² simulated maps including clustering and instrumental noise. The turquoise, dark blue, and gold lines are the number counts in a simulated catalog of 274  deg² without noise, with instrumental noise only, and with both instrumental and unclustered confusion noise, respectively. Blue and purple arrows illustrate the impact of instrumental and confusion noise, respectively.