SDSS DR9 colour image with uGMRT Band 4 full resolution overlay. The GMRT contour data are the same as presented in the bottom-left panel in Fig. 4. The contours are placed at [4, 8, 16]×σ; σ = 11 μJy. A red circle marks a detected radio source that coincides with a large elliptical cluster galaxy, which indicates that the region marked with a ‘C’ in Fig. 4 is a tailed radio galaxy.