Exponential plus Gaussian fit of the emission from RBS 797 (Eq. (1)) for VLA (left) and LOFAR (right) images. The blue solid line refers to the total best fit (mini halo plus AGN emission). Points refer to the mean brightness per square arcsec observed in each annulus, and the dotted blue line shows the thresholds we have considered (, with N_beams being the number of beams sampled in each annulus). The green line refers to the exponential mini halo fitted profile, the purple line to the gaussian AGN fitted profile. Best-fit parameters are listed in Table 4.