The left panel shows the RACS-mid (887 MHz, with rms of 0.3 mJy beam⁻¹) contours on the SI map between 200 MHz GLEAM and the convolved 1400 MHz NVSS maps. The RACS-mid contours are plotted at 3 rms × 2ⁿ (n = 0, 1, 2, 3 ...). The right panel shows the radio spectra of both outer lobes (SW and NE) and NE inner of the target source fitted with the JP model with SYNAGE (for details, see Sect. 3.5).