(a) Schematic picture of a toy model with a single star embedded in a dust disk. τ_LOS and τ_⊥LOS are optical depths at V-band (λ = 5500 Å) along the line of sight and perpendicular to the line of sight. The two parameters that serve to vary the dust geometry. The resulting attenuation curves from this model are influenced solely by scattering processes, which vary in response to changes in the star–dust geometry. (b) Relationship between A_V and slope based on this simple toy model. Different line styles represent different τ_⊥LOS.