Radio map contours and residual map of images of CID-346. The beam is represented by a ellipse on each image. The dashed lines indicate the position angles of the extended structure. Left: VLA A-array with contours [−2, 2, 4, 6, and 8]σ. Middle: VLA-COSMOS radio map with contours plotted at [−2, 2, 4, 6, and 8]σ. Right: VLA-COSMOS residual map after removing central source with CASA with contours plotted at [−2, 2, and 4]σ. The VLA A-array observations were conducted at 6.2 GHz, while the VLA-COSMOS survey was performed at 1.4 GHz. The cyan arrows indicate the extended radio structure.