Examples of (l–V) and (b–V) cross scan maps of [C ii] and [C i] along 3 LOS: G305.1+0.0 (upper panels), G026.1+0.0 (middle panels), and G049.1+0.0 (lower panels). The l-scans are at b = 0°; b-scans are at corresponding longitudes given in the images. The [C ii] emission (in units of main beam antenna temperature, Tmb) are displayed in color with values indicated by the color wedges. The [C i] emission (Tmb) contours are overlaid on the [C ii] maps, and their contour values are 0.2, 0.4, 0.8, 1.6 and 3.2 K. These maps show the low brightness diffuse [C ii] emission along with the brighter narrow velocity features. The maps are centered at the indicated longitudes in each panel. The [C i] contours identify the underlying [C ii] emission as those associated with the denser H2 molecular gas, while [C ii] emission without associated [C i] indicates a diffuse gas component. The vertical arrows mark the tangential velocities for each region.
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