Typical radio-SED with a mixture of thermal and non-thermal emission (Eq. (1)) in blue line. The corresponding thermal and non-thermal emission components are shown in blue dashed and dotted lines. We also show the effect of FFA (Eq. (2)) with a turnover at 1 GHz in orange. And the cutoff and curved model (from Klein et al. 2018) with a high-frequency break at 6 GHz in green and red respectively. The grey-shaded area shows the region of the SED explored in this work.