Fitted model spectra for the FCES G78.74+1.56 and FCES G80.00+0.50 emission components, for model setup H1 (top) and H2 (bottom). A fit of the model to the spectrum of FCES G78.74+1.56 is done first, with the injection luminosity as fitting parameter, followed by a second fit to the spectrum of FCES G80.00+0.50, with ionised gas column density as fitting parameter. This last fit includes a contribution to the emission from a background population of CRs (see text). The full extent of the error bars corresponds to the quadratic sum of the statistical and systematic uncertainties, while the caps mark the contribution of the statistical uncertainty only. The first χ² corresponds to the fit to FCES G78.74+1.56 and the second one to FCES G80.00+0.50.