Mass function of stellar haloes found in the simulation from CAMELS at z = 0 (red line). The mass of the galaxy on the horizontal axis, M_gal, refers to the stellar mass inside the half-mass radius of the stellar halo. The red shading represents the Poissonian, uncertainties. The dashed green lines corresponds to the best least-squares fit of the differential mass function to a Schechter (1976) parametrisation.