Spectra of electrons produced at SNRs from type Ia progenitors for α = 4.3. We illustrate the effect of the different prescriptions for the magnetic field amplification and an increased duration of the ST phase, T_SN = 80 kyr (thin lines). The dash-dotted line indicates the spectrum of particles accelerated at the shock, the solid lines the spectra of electrons liberated into the ISM after losses downstream of the shock, and the dotted lines the upstream escape flux. In the bottom part of each panel we also show the slope of the spectrum q(p) at a given momentum.