Pseudo-collapsed 3-point function averaged over disc set A for the raw (upper figure) and SEVEM foreground corrected (lower figure) 143 GHz map at N_side = 512 for different values of sky coverage (f_sky). Estimates of the multipoles for ℓ ≤ 18 are removed from the sky maps. The black solid line indicates the mean for 1000 MC simulations and the shaded dark and light grey regions indicate the 68% and 95% confidence regions, respectively, for the CG90 (f_sky = 0.9) mask. See Sect. 4.3 for the definition of the separation angle θ.