Result of the binning procedure for one source in the sample, used as input for the model optimization. As gray data points we show the observations compiled in Paper IV; the upper limits are shown as downward triangles. The orange squares represent the binned fluxes while the orange error bars show the uncertainty in each binned flux. This uncertainty reflects both the intrinsic uncertainty in the data as well as the spread in the flux measurements within the same frequency bin. The red rectangle represents the area of acceptable synchrotron peaks based on the data, following the procedure described in Section 2.3.