Same as Fig. 3, but varying the inner limit of the injection z_in as reported in the caption. In the cases with the largest z_in, i.e. with the heating reaching higher density layers, the contribution of two further neutrino emission channels becomes important, namely the emissivity from the formation and breaking of Cooper pairs of superfluid neutrons (e.g. Page et al. 2009) (empty-dotted lines) and the one from n-n and e-ion bremsstrahlung (double dashed lines).