Ratio at z = 0 of the halo mass functions from simulations affected by PNG aliasing to the de-aliased corresponding simulation (see Section 3.1). As indicated in the legend, the line colours correspond to the different PNG models used in the simulations. The shaded area represents the 1% variation around the de-aliased simulations. The PNG aliasing signal produces variations below 3% in the halo mass function at z = 0.