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Fig. 2


From left to right and top to bottom: observed line profiles of the J = 2–1 transitions of CS, C34S, 13CS, C33S, and 13C34S, the J = 3–2 transitions of CS and C34S, and the J = 6–5 transitions of C34S and 13CS, in the +50 km s−1 Cloud (EQ J2000: 17h45m50.20s, −28°59′ 41.1′′). Measured profiles are shown in black; the resulting Gaussian fitting is presented in red. For the CS J = 2–1 and J = 3–2 lines, a double Gaussian fitting was performed to account for the self-absorbed component (in green) in an attempt to retrieve the undisturbed emission line (in blue) (see Sect. 4.1). All the other lines are well fitted by a single component. In the case of 13C34S J = 2–1, the companion line is subtracted because of its relatively strong emission and potential contamination. The dashed vertical linesdenote the 13CS J = 2–1 peak position (46.94 km s−1, see Table 2). Dash-dotted red lines denote the redshifted velocity (vr = 63 km s−1) at which the CS J = 2–1 and J = 3–2 transition lines are not affected by self-absorption (see Sect. 4.1). Nearby lineslikely observed are labelled.

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