[7.5.3.3] \boldsymbol{\tau}(2\boldsymbol{\pi}; \boldsymbol{\theta}_{\mathrm{t}}, \boldsymbol{\phi}_{\mathrm{t}})

The ratio of transmitted flux collected over an element of solid angle surrounding the given direction to the incident flux from the entire hemisphere. (See Figure 17.)

Note: The direction of collection and size of the solid angle “element” must be specified.

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