Clumps C2 and C3. a) Colour image with the Spitzer 5.8, 4.5, and 3.6 μm emissions in red, green, and blue, respectively (logarithmic units). The red contours are the column density contours (same levels as in Fig. 21b). The candidate Class I YSOs #4, #5, #6, and #7 are identified. The positions of the methanol masers are indicated by plusses. b) Colour image with the 70 μm, 5.8 μm, and 3.6 μm respectively in red, green and blue (linear units). c) The red column density contours are superimposed on the MAGPIS radio-continuum image. The UC H ii region is identified.