Global energy budget for a dense and massive model of 9.5 × 10⁸   M_⊙ (ρ_c,gas = 0.071m_H/cm³, c_⋆ = 0.05 and ϵ_SN = 0.03) as a function of time. The total energy (in black) is the sum of all other lines, namely: the total potential energy (in red), the total kinetic energy (in green), the gas plus stellar internal energy (in yellow), the radiative cooling energy (in blue), and the SNe feedback energy (in orange). The latter is negative because it corresponds to energy injected into the system.