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Fig. 1

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Top. Example of a Hi-GAL starless clump (nominal position represented with a yellow “+” sign) with an irregular shape (shown by the black area, against the gray-scale background, representing the 160 μm emission). No MIPSGAL or other source found with the Mexican Hat Wavelet algorithm, also named as MHW24 source (see Sect. 3.1),(shown with the “∗” and “diamond” symbols, respectively) is falling within the black area and thus they cannot be associated with the Hi-GAL source. Bottom. Example of a proto-stellar Hi-GAL clump. One MHW24 source is associated with the submillimeter clump, but no MIPSGAL source satisfies the coincidence and color criteria.

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