Here are the commands we can send to the instrument to set it up to make measurements on a portion of the display:
//These commands set our measurements to the Cursor Region and set the region to be //from the center of the screen to 4 divisions to the right of center. The region points are from Zero to 601. 301 is the center and each division is 50 points wide.
//When we request the measurement we can now see that it is only related to the data within the cursor region: