Fig. 4
Radius at which the optical depth τλ = 1 as a function of the wavelength for the three models at the same time as in Fig. 2: MU2 (black), MU10 (red), and MU200 (blue). The solid line shows optical depth with an inclination of θ = 90°, and the dashed line that of θ = 0°. The dotted line at R = 10 AU roughly represents the FHSC’s outer boundary.
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