Mass spectra with varying polytropic index γ₀ at low densities, same color coding as in Fig. 2. Lognormal fits are shown with thin lines for reference. Top panel: γ₀ = 1.2; bottom panelγ₀ = 0.7. The mass spectra are very similar to those of the canonical run, and mostly importantly the peak position is not altered. The high-mass end slope of run T10G12 seems to be slightly steeper, and that of T10G07 shallower in the mass range from 0.1 to 1 M_⊙.