Emission map at 8 μm from the Spitzer/GLIMPSE survey. Black contour levels at 8.6 and 9.9 K correspond to the CO emission. Blue contour levels at 0.5 and 1.5 Jy beam⁻¹ correspond to the ATLASGAL survey at 870 μm, which traces the compact, high-density structures. The green crosses show the spots of molecular masers, while the black and red asterisks show the positions of WR 1051−67 and the O7 V star, respectively. The spatial distribution of cYSOs obtained from the GLIMPSE I+II+3D catalogue is shown with red (class I) and black (class II) crosses.