T − n joint distribution for all gas (first column), gas that is initially CNM (species C ₀; second column) and WNM (species C ₂ ; third column), and T − v joint distribution (last column) of the gas at 10 kyr (t/t _sf,WNM ≈ 0.3, t/t _sf,CNM ≈ 4) without (upper panel) and with (lower panel) thermal conduction. Annotated are the main components of the ISM, along with a significant fraction occupying intermediate regions. Dashed lines in the last column mark the boundary of ∣v∣ =  5 km s⁻¹ and T  =  5050 K used for the definition of gas phases to distinguish the three components. Thermal conduction increases the contribution of CNM to hot gas.