Example of surface brightness data and clump extraction. Left frame: 850 μm map of one snapshot (number 377), with the view direction x and assumeddistance of d = 351 pc. Right frame:cold residual at 350 μm (857 GHz) for the area indicated with the dashed box in the first frame. The cyan ellipses correspond to the clumps that have been detected with S/N above four at all three Planck wavelengths and have reliable photometry in those bands and at 100 μm.