clipboard creation menu
The clipboard resides entirely in memory; in order to save the contents of a clipboard, you must save it to disk using the Save clipboard menu. This also means that you can toss the contents of a clipboard by just creating a new one, or leaving the clipboard menus altogether.
The Rows and Columns values determine the resolution of the clipboard; larger values will give you more dots per inch on hardcopy, but with larger clipboards, everything takes longer. A good starting value for 8.5" x 11" plots is 100 dots per inch, or 850 for Columns and 1100 for Rows.