I-band optical image of PKS B1718–649, overlaid with the column density contours (black) of the neutral gas. The contour levels range between 7 × 1019 cm-2 and 8 × 1020 cm-2 in steps of 1.5 × 1020 cm-2. The unresolved continuum radio source is indicated in white. The H i disk has the shape of an incomplete ring with asymmetries in the NW and in the S of the disk (Maccagni et al. 2014).
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