Mass of the black holes and neutron stars in BHNSs as a function of the initial semi-major axis of the progenitors. The upper (lower) panels show the mass of the compact object produced by the primary (secondary) star. The orange dashed line represents the threshold at 3 M_⊙: compact objects below this limit are classified as neutron stars, while those above it are black holes. The 2d-histograms show the number of BHNSs per bin produced in the CHE10preMS and NoCHEpreMS models at metallicities Z = 0.001 and Z = 0.004. The marginal histograms show the distributions of the compact remnant masses for the CHE10preMS (black histograms) and NoCHEpreMS (grey-filled histograms) models at Z = 0.001 and Z = 0.004.