Left: spectral indices for the sources in our sample measured between J-band (2MASS, 1.235 μm) and, respectively, 70 μm, 100 μm, 160 μm (Herschel/PACS) using the definition in Eq. (3). The vertical lines show the spectral indices obtained with our disk model for different values of the flaring reduction parameter f, from a fully-flared model (f = 1, dotted line) to less flared models (f = 0.5,0.3,01, respectively dash-dotted, dashed and solid line). Right: scale-height of the disk surface layer computed by the model.
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