Linear Fresnel Secondary Concentrator

In the model of "Molten Salt Linear Fresnel," I find that the software dose not has the corresponding input parameter about CPC (secondary parabolic mirror). How to consider the influence of the secondary mirror in the simulation calculation?

To model a linear Fresnel system with a secondary concentrator above the receiver, you should include the secondary concentrator optical effects in the optical table under "Collector Geometry and Optical Performance" on the Collector and Receiver page. The table defines all optical losses between incident sun and light incident on the heat collection element.

Thank you for your reply, Paul Gilman