Detail of Fig. 1 (blue: PACS 70 μm, green: PACS 160 μm, red: SPIRE 250 μm) showing the location of the stellar population with respect to the large-scale bipolar nebula and ring-like structure (MTHM13). Symbol sizes are scaled to the K_s-band magnitude. Most bright class II objects (green) are located along the major axis of the ring, with the OB stars (blue) in the center. Along the western ridge – the inner rim of the ring – some class 0/I objects (red) are found, including those powering two HH jets. Fainter class II sources are located all over the cluster. The stellar surface number density (contours, see text) is highest inside and along the ring and peaks significantly at the location of the OB stars. The contours decrease linearly from 2500 pc^-2 to 250 pc^-2. The boxed region indicates the SOFI field of view.