Top: H I total intensity map and R-band optical image of NGC 6824 with overplotted H I total intensity contours: 7.0, 26, 45, 104 × 1019 atoms cm-2 (left and middle panels respectively) and first-moment map of NGC 6824 (right panel). Bottom: the same for UGC 11919; contours: 5.4, 20, 35, 80 × 1019 atoms cm-2.
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