Spectral Energy Distribution of RCW 86 with the best-fit leptonic one-zone (top) and two-zone (bottom) models. The radio points are from Molonglo at 408 MHz and Parkes at 5 GHz (Caswell et al. 1975; Lemoine-Goumard et al. 2012) and lower limits from MOST at 843 MHz and ATCA at 1.43 GHz (Whiteoak & Green 1996; Dickel et al. 2001). X-ray spectra from ASCA and RXTE are from Lemoine-Goumard et al. (2012). The Fermi-LAT spectral points and upper limits (95% C.L.) derived in Section 3.2 and the H.E.S.S. data points in the VHE γ-ray domain from H. E. S. S. Collaboration et al. (2016) are also shown.