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The observed HI mass surface densities of 6.3 to 9.2 M$_{\\odot}$ pc$^{-2}$ are consistent with HI-to-H$_2$ transitions dominated by HI-dust shielding in predominantly atomic envelopes. For each source, we constrain the dimensionless parameter $\\alpha G$, and the ratio $I_{\\rm UV}/n$, of the FUV intensity to hydrogen gas density. 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