Fig. 2
NACO K − L versus H − K color-color diagram. The blue curve denotes the intrinsic colors of main-sequence stars (Ducati et al. 2001); the cyan line corresponds to the locus of T Tauri stars (Meyer et al. 1997). Reddening vectors (dashed lines) with slope of E(H − K) /E(K − L) = 1.2 (Hoffmeister et al. 2008) are drawn. Their lengths equal to visual extinction of 90 mag.
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