Fig. A.1
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Observed 13CO intensity weighted velocity map (moment 1). Note: the velocities have been corrected w.r.t υLSR and the sign changed to allow comparison with Fig. 3. The first moment is calculated in a velocity range from −15 to +15 km s−1 with respect to υLSR, and pixels where emission is below 3σ (σ = 0.012 Jy beam−1 km s−1) are masked out.
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