Left and middle panels: fitting the FBs’ SED with the hadronic model (left panel) and the leptonic model (middle panel) described in the text. The red curve shows the fitted spectrum and the red hatched region spans all spectra resulting from different templates for South 1; blue curve and hatched region are for South 4. For leptonic models, for South 1 we assume the broken power law described in the text and the ISRF value given by GALPROP. For South 4, the black curve is for the same broken power law with the ISRF floating while for the gray curve we use the ISRF in GALPROP at the position of South 4 and a Maxwellian type electron distribution with E_bk = 300 GeV. In our hadronic scenario energy-dependent diffusion effects are considered as described in the text. Right panel: the enhancement factor due to anisotropic IC. The IR and Opt/UV components of the ISRF have effective temperatures of 100 K and 5000 K, respectively. Results for z = 5 kpc and z = 7 kpc are shown (approximate heights of South 1 and South 4 above the Galactic plane).