HP 54710A User's Reference Manual page 373

Mask Menu
Edit Mask
To edit a polygon
1 Set the coordinate system in the Scale menu.
2 Select the polygon number with the polygon softkey in the edit mask menu.
3 Press the Edit polygon softkey.
4 Press the Point softkey.
5 Use the knob or keypad to select the point on the polygon you wish to edit.
The scope will not let you select a point that is not defined.
6 Edit the selected point.
To delete the selected point, press the delete softkey. To insert a point or
move a point, use the X and Y softkeys to move the cursor to the desired
location. Then press the Insert softkey to insert a new point, or press the
Move softkey to move the selected point to the new location.
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