Phase space diagram, showing the emission-weighted density (⟨ρ_hot⟩) and temperature (⟨T_hot⟩) in the hot bubble. The size of the markers represents the feedback efficiency, defined here as η_feed = L_w/Q_w, and the colourbar shows the time. The upper, middle and bottom panel present IZW18, dwarfA and MW metallicity simulations of the same cloud with initial properties: log(M_gas,0[M_⊙]) = 6.23, R_cl,0[pc] = 25.7, and ϵ_ff = 0.3. See the text for a full discussion on how these quantities were estimated.