Two-color image of the region indicated by the rectangle of Fig. 5: 8.0 μm (in red), 24.0 μm (in green), and TeV emission (white contours). The yellow contours represent the ¹³CO emission integrated in the 53–60 km s⁻¹ velocity interval (contour levels: 6.5, 8.3, and 10.4 K km s⁻¹). Magenta crosses indicate the position of the infrared HII regions, green circles the position of the infrared-dark clouds, and the cyan cross the methanol maser. The list of sources is given in Table 4.