Top: sampling of the spectral index map between 1.7 and 6 GHz (left) and age map (right) with beam-size (12″ × 7″) elliptical regions along the lobes and wings. The region “0” indicates the centre of the source. Middle: spectral index profile along the wings (left) and primary lobes (right) derived from the sampling above. The index α steepens in both the directions, from the centre to the outer regions. Bottom: radiative age profile along the wings (left) and the primary lobes (right). The red points represent the analytical age (Eq. (2)), the green points represent the values derived from the age map (BRATS). We note that they are consistent within 1σ errors. The age increases towards the outer parts of the source and we estimate a difference Δt = 22 ± 7 Myr between the ages of the wings and lobes.
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