YSO statistics. The surface density of sources is shown as a function of the distance ( >2′) from the field centre. The mean values over all fields are shown for Class I-II (thick red line) and Class III (thick yellow line) candidates. The thin red lines correspond to Class I-II sources in individual fields. The shading corresponds to a region with less than one source for a given distance. The two overlapping stars indicate the density of Class I-II candidates in all clumps (all fields) selected by the Fellwalker algorithm (red star) and in clumps belonging to the P(χ2 ) = 85% sample (blue star).
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