Fig. 1.

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Top panel: Image at 144 MHz ORC J0823+6216. The resolution is 5″, with the beam shape visible in the bottom left of the image. The insert shows the optical field from PanSTARR (DESI for all other images) with the identified optical counterpart. The red “x” in the radio image marks the position of the optical counterpart. Bottom panels: Images at 144 MHz and brightness profiles. Contours start from 3σ and end at the maximum value of the color bars with a square root scaling. White contours trace the low-resolution (20″) 144 MHz brightness. Pixels are blanked (white) where a compact point source is identified within the ORC’s confines. The green/blue dots identify the center of the green/blue ellipses that trace the ORC’s shape. The right part of the panel shows the profile along elliptical annuli with the vertical dashed lines drawn at the length of the ellipse’s semi-major axis. The correspondence with a peak proves the enhancement of brightness along the ellipses line.
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