Radiative cooling rates under CIE conditions obtained with our new microphysics module, including elemental contributions L_κ (scaled by (m_H/ρ)² in the first, second, and fourth panels, and by (n_en_H)⁻¹ in the third panel, respectively) and net cooling function for Solar and WC abundances. Top: elemental contribution of the cooling curve for solar abundances, as specified in Table 2. The black solid line represents the net cooling curve. Second: elemental contribution of the cooling curve for WC abundances, as indicated in Table 2. The blue solid line represents the net cooling curve. Third: comparison of the net cooling curves for solar abundances with those derived by Sutherland & Dopita (1993) and Wiersma et al. (2009). Bottom: net cooling curves for WC abundances compared with the cooling function obtained by Eatson et al. (2022a).