[7.3.3.8] \boldsymbol{\rho}(\boldsymbol{\theta}_{\mathrm{i}}, \boldsymbol{\phi}_{\mathrm{i}}; \boldsymbol{\omega}_{\mathrm{r}})

The ratio of reflected flux collected through a conical solid angle to essentially collimated incident flux. (See Figure 12.)

Note: The direction of incidence must be specified, and the direction and extent of the cone must be specified.

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