SED for a low (top panel) and a high magnetic field scenario (bottom panel). The red dots represent the VLA flux (Benaglia et al. 2010), the green arrow is the Suzaku upper-limit (UL) in 0.3–10 keV (Terada et al. 2012), the purple arrow the XMM-Newton UL in 0.4–4 keV (Toalá et al. 2016), the orange arrows the Fermi UL in 0.1–300 GeV (Schulz et al. 2014). The grey and black solid lines are the instrument sensitivities for 100-h HESS and 100-h CTA, respectively (Funk et al. 2013).