Solid lines represent the power spectrum of PNG-UNIT halos within the different halo mass bins (see Table 3 for the mass ranges). Shaded regions show the standard deviation around the mean power spectrum of the FASTPM mocks, generated using halos in mass bins that reproduce the clustering and the abundance of the N-body simulation (see Sect. 4.1). There are no halos in the two lowest-mass bins (1 and 2, shown in dark blues) in the FASTPM mocks since the mass resolution is not high enough to resolve them. The top panel shows the f_NL = 0 case, and the bottom panel shows the f_NL = 100 one.