Top panel: variation with temperature of cooling function arising from different processes obtained using equilibrium values of hydrogen fractions (that vary with temperature as shown in Fig. 2) in units of erg cm³ s^-1 for a total number density n₀ = 10⁵ cm^-3. Bottom panel: different components of radiative cooling functions with same initial number density, n₀ but for fixed values of concentration fractions (mentioned in the figure). In both panels, the sum of all the components is drawn with a black dashed line to obtain the value of Λ in erg cm³ s^-1 following Eq. (32).