delete <plot number>, ...
The delete command is part of the multiplot environment; it removes plots, arrows or text items from a multiplot page. The desired items should be identified using a comma-separated list of their reference numbers, which count sequentially from zero for the first item created on a multiplot page, and are displayed on the terminal when items are created. For example:
delete 1,2,3
removes item numbers 1, 2 and 3.
Having been deleted, multiplot items can be restored using the undelete command.