Plotting: How to compute and plot room acoustics parameters such as reverberation time?

The room acoustics parameters, e.g. reverberation time and clarity, are available in a plot type called Room Ac. Parameters. This plot type has like the other plot types a Settings dialog box (can e.g. be accessed by typing F5). From this dialog box, the type of parameter to be plotted is selected. Note that only a few settings are available in this dialog box, the rest of the settings are taken from Room Acoustic->Calculation Options… and Room Acoustics->Parameter Settings....