If is checked, written information is added to the time window in the Time Data plot type as shown below
In the example below was selected. If you instead select , the text will be displayed inside the window as shown below.
If is checked, a picture used for detecting echoes etc. should be displayed as shown in the figure below.
Note: This only works if the vertical axis is set to dB since the picture has dB as y-axis. For more details see How to detect echoes from a measured impulse response? in the FAQ section.