Left: spectral energy distribution of SMG1. The dark blue points mark the SPIRE fluxes as referenced in the HerS catalog (Viero et al. 2014). The light blue point shows the NIKA2 260 GHz flux measurement described in Sect. 4.2. The solid blue line represents the SED that best fits these four fluxes, and the blue envelopes mark the 1σ and 2σ confidence intervals. The shaded green region shows the NIKA2 150 GHz bandpass. Right: probability distribution for the flux of SMG1 in the NIKA2 150 GHz map. An SED is computed for each set of parameters sampled by our MCMC and integrated in the 150 GHz bandpass to obtain a flux value at this frequency. The histogram in pale blue shows the distribution of the set of computed fluxes. Kernel density estimation is applied on the whole set of fluxes to estimate the probability distribution for the source flux in the NIKA2 150 GHz map, shown as a solid blue line. The flux obtained from the maximum likelihood SED is shown as a dashed black line.