Left: three frequency spectral curvature map of the halo at 15″ resolution, created using 675 MHz, 1.5 GHz, and 3 GHz radio maps. The image properties are given in Table 2, IM3, IM7, and IM13. The halo shows a hint of spectral curvature. The SC is negative for a convex spectrum. Contour levels are drawn at [1, 2, 4, 8, …] × 3.5 σ_rms, and are from the uGMRT Band 4 image. Right: regions where the radio spectral index values were extracted between 675 MHz and 3 GHz. Each box has a width of 15″ corresponding to a physical size of about 67 kpc. The same regions are used to obtained α − I_X correlation in the left panel of Fig. 15.