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Fig. 2

image

Examples of lV and bV maps in H i, [C ii], [C i], and 13CO emission for LOS G030.0+0.0: a) lV maps; and, b) bV maps. The l-scans are at b = 0°; b-scans are at l = 30.0°. The intensities are in main beam antenna temperature (Tmb) with values indicated by the color wedges. These show low brightness diffuse [C ii] emission along with the brighter narrow velocity features. Comparison of the spatial and velocity structures in the [C ii] maps with those of [C i] and 13CO delineates the [C ii] arising from the denser H2 molecular gas from the diffuse component. The vertical dashed line represents the tangential velocity for these regions. The velocity resolution in all maps is 2 km s-1. The spatial resolutions are given in Table 1. The black arrow in the top panel marks an H i self-absorption (HISA) feature.

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