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Fig. 2

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Left: robust-weighted integrated column density map. Contour levels are (1,2,5) × 1020 cm-2 (black) and 1 × 1021 cm-2 (white). The gray box shows the area shown in the right-panel. Right: integrated H i column density based on the robust weighted cube overplotted on a deep KPNO Hα image. Contour levels are the same as in the left panel. The main Hα distribution is encompassed by the 1 × 1021 cm-2 contour, with low-level Hα primarily found within the 5 × 1020 cm-2 contour. Virtually no Hα is found outside these countours. The bright source in the top-left is a residual continuum artifact.

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