Double-boomerang morphology of XRG 223.1 can be clearly seen in the above figure based on Fig. 4b of Black et al. (1992), where VLA 8 GHz 2.5″ image contours of 3C 223.1 are shown with polarisation vectors. The contours are drawn at (−4, 4, 6, 9, 12, 15, 20, 30, 50, 100, 150, 200, 300, 400, 500, and 600) × 55 μJy beam⁻¹ (rms or σ_I). For the polarized intensity, the σ_P is ∼36 μJy beam⁻¹ and the vectors are drawn only at regions which have a surface-brightness > 4σ_I. We have marked outline of the ‘double boomerang’ in red colour along with the dashed line showing 40° position angle of the disk of the host galaxy (Fig. 1a).