Physical parameters derived from the model SEDs from the grid of Robitaille et al. (2006) compared to the inclination w.r.t. line of sight. Edge-on is defined as 90°. The dashed red lines indicate the evolutionary stage boundaries. Top: bolometric temperature Tbol varies largely as it inclines more toward face-on (0°). The blue lines are models with a small difference in Tbol with inclination; these have dense envelopes. Green and magenta show the models with an increase in Tbol when the inclination is close to face-on. Middle: the infrared spectral index from 2 to 24 μm oscillates without relation to inclination. This is most likely an effect of the ice feature at 8 μm. Bottom: the luminosity ratio Lfir/Lbol is independent of inclination, but there is no clear boundary for systems at different evolutionary stages.
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