Cosmic gamma-ray background in the 1–30,000 keV range, from different sources. Shown as the dot-dashed dark-green line is the predicted contribution by SNe Ia, when adopting the 2σ upper limit of the SN Ia rates from CANDELS (Rodney et al. 2014), while in blue is that corresponding to the 1σ upper bound of the rates by Okumura et al. (2014), and in magenta we show the gamma-ray background from the upper 2σ to the rates from Subaru/XMM-Newton (Okumura et al. 2014), the magenta line (2σ upper bound) being very unrealistic. The long-dashed black line is the contribution from FSRQs (Ajello et al. 2009), while the solid black line is the total gamma-ray background of the long-dashed black line (FSRQs) and background from the 1σ upper bound of SN Ia rates from Subaru/XMM-Newton (Okumura et al. 2014). This gives a good fit to the observed gamma-ray background of SMM (Watanabe et al. 1997) but only because of the FSRQ contribution.