Fig. 3

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Three-color composite image of the Herschel H2 column density map (green) and the blueshifted and redshifted Nobeyama 13CO emission (red: 7.85–9.75 km s−1 and blue: 11.65–14.25 km s−1; see also Figs. 2g and i). The white contours correspond to Ay levels of 8, 16, 24, 32, 64, 128, and 256mag (assuming ; Bohlin et al. 1978) in the Herschel H2 column density map at an angular resolution of 18″.2.
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