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Fig. 3


Spectra of the 12CO R(0), P(1), and P(2) transition lines resulting from the addition of all the observed IR source spectra. The light blue rectangles show the positions of the lines at vLSR ~ − 40, −60, −85, and − 145km s−1 present in all the spectra and that we attribute to foreground clouds. The magenta, blue, and green rectangles show the positions of the lines at velocities vLSR ~ −185, −130, and +50 kms−1, respectively. They are present in two of the transition line spectra (R(0) and P(1) in the case of the lines at vLSR ~ −130 and −185 km s−1, and R(0) and P(2) in the case of the line at vLSR ~ 50 km s−1).

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