Fig. 9

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Backgrounds: strengths of HINSA measured in the snapshot mode, extracted using method 2. Black contours: 13CO J = 1–0 emissions, which have been smoothed to the angular resolution of H I observations. Big black boxes: areas covered by CO data. Blue crosses: sampled points of the FAST, and red circle: center beam. Small red boxes and triangles: Class I/II and Class III YSOs. In panels a and c, the white contours represent the emission of C2H N = 1–0 within the white rectangles (Liu et al. 2019). In panel f, the small black rectangle represents the mapped region of the IRAM HCO+ J = 1–0 and C18O J = 2–1 observations, which are shown in Fig. 14.
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