Distribution of slopes measured in the color-color and color-magnitude diagrams. The figure shows slopes for J − H vs. H − K (top), J vs. J − H (middle), and K vs. H − K (bottom) diagrams. We plotted the expected slopes for each physical mechanism as line segments, following the ranges in Table 7. The X mark shows the exact position of the T Tauri Locus. The black circle shows the slope expected for the typical dust opacity index in the ISM. Black bars show the stars in S₁ sample and with precision in the light curve better than 5%, empty bars show stars in the S₂ sample or with precision worse than 5%.