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Fig. A.7

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Top: grayscale GLIMPSE 8 μm image of the GMF F341.9–337.1. The blue and yellow contours show the 13CO integrated intensity of 2 K /km s-1, integrated over the velocity ranges [–47, –32] km s-1 and [–38, –20] km s-1 respectively. The red contours show the ATLASGAL emission at a contour level of F870 μm = 250 mJy/beam. The red boxes show regions with poor ThruMMS data or absence of it. The filled geometric objects show all the dense gas measurements from different surveys with vLSR within the velocity range indicated in Table 2. Symbols as in Fig. A.1. Middle: position-velocity diagram of the 13CO line of the GMF 341.9–337.1, obtained from a slice following the extinction feature used to identify GMF 341.9–337.1. Bottom: PV diagram of the 12CO emission between | b | ≤ 1°. The yellow line shows GMF 341.9–337.1 in the PV space. The green solid line shows the Scutum-Centaurus arm as predicted by Reid et al. (2014) and the dashed green lines show ±10 km s-1 of the velocity of the spiral arm.

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