Top left panel: integrated radio spectra of the halo, “Chair-shaped” filament source and total (halo+“Chair-shaped” filament source). Top right panel: spectral index variation with respect to frequency for the halo and “Chair-shaped” filament source. Bottom left panel: integrated radio spectra of extended sources HT, B and F. Bottom right panel: integrated radio spectra of compact source C, C2 and C4. The down arrows represent the 3σ detection limit. Data from literature (Bonafede et al. 2009b; survey data) are plotted at 4.86, 1.4, 0.325 and 0.074 GHz along with 0.61 and 0.235 GHz GMRT data.