this
Description
If you select the Xvar button in the Plot dialog, the following dialog will appear:

Variable k z x s e h d v


This dialog makes it easy for you to change the horizontal axis Plot variable in the Plot dialog . The variable names and the meaning of the Column Index field are described in the Plot variables section.

Set
This button transfers the current variable and column index to the Xvar field in the Plot dialog.

Clear
This button clears the Xvar field in the Plot dialog.