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Fig. 2


Histogram of the KS − [18] colour of the stars detected at 18 μm for each spectral type star. The results of Gaussian fitting of the histograms are indicated by the dashed lines. The three vertical dotted lines indicate the peak position μKS −  [ L18W ]  (middle), and 2σ positions (left and right) of the distribution of the KS − [18] colour.

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