Select data from the event lists.
Syntax:
xsel > select event <event_sel>
Examples:
To select data from within a circular region centered on (X,Y)=(125,125) with a radius of 10.0..
xsel > select event ''Sqrt((X-125)\^2 + (Y-125)\^2) < 10.0"
Note that for region selection and timing selection, it is quicker to pass the criteria as filters to the extract command.