Cooling timescales for protons, as a function of energy, for two galaxies with Ṁ_∗ = 0.005 (solid lines) and 200 M_⊙ yr⁻¹ (dotted lines), in the base (0) scenarios. The blue and yellow lines indicate p-p scattering and ionisation, respectively. The black lines represent diffusion timescales (dot-dashed and dashed for K0 and B0 scenarios, respectively), whereas the grey double-dot-dashed line is the advection timescale.