ATCA Hi channel maps. Hi contour levels are (−6, −3, 3, 6, 12, 24, ...) ×σ (negative values in dashed line), where σ = 1.2 mJy beam-1 per 5 km s-1 channel. Each panel is centered on the middle of two galaxies with the size of ~60 × 120 kpc2 assuming a distance of 9 Mpc. Red crosses represent the optical center of individual galaxies. The velocity of the channel is shown on the top right of each panel in km s-1. The ATCA synthesized beam (218 arcsec × 85 arcsec) is indicated by a blue solid ellipse on the bottom left channel with its coordinates.
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