Left: three-colour image where the 8, 24, and 70 μm emission obtained from the IRAC and MIPS cameras of the Spitzer Space Telescope (from SAGE Spitzer; Meixner et al. 2006) are presented in blue, green, and red, respectively. The black box shows the region mapped in the ¹³CO J = 3 − 2 line with an angular resolution of 22′′. Right: zoom-in of the mapped region (white box). The colour code is the same as in the left image, but the scales are different. The red contours correspond to the ¹³CO J = 3 − 2 emission integrated between 230 and 245 km s^-1 with levels of 2.5, 4.0, 6.0, and 8.0 K km s^-1. The FWHM beam size of the observations is included in the bottom right corner of the region. The black circle corresponds to the position where the 16 molecular lines were observed as single pointings.