Identification of the optical counterpart. Left: H I contours on optical image obtained by stacking PS1 g, r, and i-band images. The H I contours are [6.5, 10, 15, 20] × 10¹⁹ atoms cm⁻², where the lowest contour is ∼2-σ. The thick red cross marks the VLA centroid, while the thin orange cross marks the FAST centroid from X23. Right: Color image of the galaxy from g (blue), r (green), and i-bands (red), smoothed by a Gaussian kernel of 2 pixels. Masked areas are in black.