[7.3.3.7] \boldsymbol{\rho}(\boldsymbol{\theta}_{\mathrm{i}}, \boldsymbol{\phi}_{\mathrm{i}}; 2\boldsymbol{\pi})

The ratio of reflected flux collected over the entire hemisphere to essentially collimated incident flux. (See Figure 11.)

Note: The direction of incidence must be specified.

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