Colour images composed of g, r, i band images from the HSC survey wide fields (Aihara et al. 2019), as well as the red contour of ALMA CO (1−0) moment-zero map. The contours are shown in [2, 3, 5] × rms. We also show the H I spectrum in the 20 km s⁻¹ velocity bin in the lower right corner of each panel. The FAST beam size (2.9 arcmin) corresponds to about 130 kpc at a redshfit of 0.05, which is much larger than the scale of the images.