Hydrogen in diffuse molecular clouds in the Milky Way - Atomic column densities and molecular fraction along prominent lines of sight

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Fig. 2

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As Fig. 1, showing the regions G 34.3+0.1, W 49N, W 51, and DR 21. For W 51 the P39 position coincides with the ultra-compact H ii regions W 51 e1 to e4.

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