Broadband SEDs for each region shown in Fig. 3. Observed radio and Planck data (black dots with error bars) are fitted with a synchrotron model. Observed Fermi-LAT data (red dots with error bars) are fitted with the inverse-Compton (IC) scatterings of the CMB and EBL photon fields except for S1, which only requires the seed photon contribution from the CMB. The upper limits are calculated within a 3σ confidence level.