Cooling and acceleration rates for electrons at the internal shocks of CGRBs for L₀ = 10⁵⁰ erg s⁻¹ and L₀ = 10⁵¹ erg s⁻¹ in the left and right panels, respectively. Top panels correspond to Γ = 100 and the bottom ones to Γ = 300. The different processes are indicated with the following curves: Dashed lines are for ϵ_B = 1, solid lines for ϵ_B = 0.1, and short-dashed lines for ϵ_B = 0.01. The blue curves refer to acceleration, orange ones to synchrotron, and green ones to external IC. The circles refer to SSC with (a_ep = 1, ϵ_B = 0.1) and squares to SSC with (a_ep = 100, ϵ_B = 0.1). With dashed gray lines, we also show the auxiliary results used to obtain the SSC rate with the iterative method mentioned in the text.