Integrated source number counts at 500 μm of the SHALOS candidates with P_tot >  0.5 & 0.7 (red circles and blue squares, respectively). These counts are compared with the integrated number counts of candidate lensed galaxies derived by Negrello et al. (2017) from all the H-ATLAS fields (grey diamonds). The error bars correspond to the 95% confidence interval. We also show the model source number counts for the unlensed SMGs (black line; Lapi et al. 2011; Cai et al. 2013).