Gamma-ray background obtained using the mean fit from D04 to the SN Ia rates (see Figure 4) as the black solid lines and the 1σ upper and lower bounds as blue dashed lines. The 2σ upper and lower bounds are shown as the red dashed lines. With those rates, the SNe Ia cannot account for the observed gamma-ray background. We have used here the fully mixed W7 model (W7fm), as in all the other figures. Indeed, our results for the cosmic gamma-ray background shown here as the black solid line coincide with those of AKH05.