Fig. 4

Left: DSS I-band image of UGCA 105, overlaid with
contours of the 3986 ×
38
36
resolution column density map at 1.5, 5, 10, and 15 × 1020
atoms cm-2. The red ellipse represents the extent of the optical disk
(r25). Right: H i column
density map at the same resolution. Contour levels are 0.15, 0.5, 1, 1.5, 3, 5, 10,
and 15 × 1020 atoms cm-2.
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