Zoom into the two central clumps 1 and 2 (see Fig. 1). The left and middle panels present in color-scale the Spitzer 8 and 24 μm emission, whereas the right panel shows the Herschel 70 μm image. Color-scale is again to highlight the main features with dark low and yellow high intensities. The contours show the 1.2 mm continuum emission contoured in 3σ levels of 30 mJy beam^-1. The circle outlines the FWHM of the primary beam of the PdBI observations, and a scale-bar is shown in the left panel as well.