PNG-response parameter p as a function of the halo mass, using different methods to treat variances. Blue and orange symbols show results for the non-Gaussian simulation, using standard variances (Eq. (14)) and fixed variances, respectively. Green and red symbols show the same after applying the matching with the Gaussian simulation. In solid circles, the fixed variances is estimated by the best fit to the FASTPM variances with Eq. (15); in rings, we use the extrapolation method. The shaded areas represent the 1σ, 2σ and the 3σ regions (from darker to lighter respectively) around the value of p we find in Eq. (19).