Colour composite image of the complex obtained using the ¹³CO (110 GHz) column density map in red (from Chavarría et al. 2008), radio emission in green (from NVSS survey at 1.4 GHz; Condon et al. 1998) and optical emission in blue (from DSS2 survey). The abscissa (RA) and ordinate (Dec) are in the J2000 epoch. North is up and east is left. The H ii regions discussed in the text are marked in white circles. The rectangular box represents the area studied in this work (the corresponding image at 24 μm is shown in Fig. 2).