Photon and neutrino luminosity for two cases with heat injection down to z₂ = 600 m for two NSs with different masses at the opposite ends of the possible values for NSs. The initial states were chosen in order to have the same quiescence photon luminosity (though the neutrino one is different). In the last panel, the fraction of the total neutrino luminosity due to the active neutrino reactions is displayed. The dominant cooling channel in the quiescence (background state) is different in the two cases, with the more massive star undergoing fast cooling via direct URCA reaction (gray line).