> ## Documentation Index
> Fetch the complete documentation index at: https://docs.plantpredict.com/llms.txt
> Use this file to discover all available pages before exploring further.
# RELEASE 11.08.0
July 27th, 2023
**Perez Coefficients are now selectable**
A new drop down field has been added to the Simulation Settings page of the prediction, where a user can select the set of Perez Coefficients that they want their Perez Transposition model to use. Historically, PlantPredict has used a set of coefficients that is similar to the “All Sites Composite”.
Here is a link to a knowledgebase article that describes the PlantPredict Coefficients: [Perez Algorithm (Diffuse Sky)](/models/transposition/perez)
The list of coefficients that are available in PlantPredict are the same as what is available in pvlib. To learn more about these coefficients, here is a link to the pvlib documentation: [pvlib.irradiance.perez](https://pvlib-python.readthedocs.io/en/stable/reference/generated/pvlib.irradiance.perez.html)
Selecting the coefficient set that is closest to the location of your project will produce the most accurate results.
**Circumsolar Treatment on PlantPredict Reports**
Since adding the ability to select Circumsolar Treatment on a prediction, we needed to update our reports and results screens to show the selected Circumsolar Treatment.
We have added the selected Circumsolar Treatment on the following pages and reports:
* Results Summary Overview
* Prediction Comparison Screen
* Plant Summary PDF
* Plant Summary 8760 XLSX
* Prediction Comparison Report XLSX
* Inputs and Assumptions (model choices)
**Added Fixed Tilt to the Design Pro Racking System Defaults**
Over the past few months, we have been adding Company Level Defaults for the Design Pro application. We are still tweaking this capability and adding things that we have missed. With this release we are adding in “Fixed Tilt” as a possible default Racking System for those customers who mostly use Fixed Tilt racking systems.
BUG FIX
* The Delete icon on the Weather Files in the Weather Library was displaying incorrectly (see below)
