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Four of the commands in the Margins menu of the Picture window.
To draw any number of equally spaced marks into the margins around the drawing area.
If you draw a Sound with a domain between 0 and 1 seconds to an amplitude range between -1 and 1, choosing Marks left... with a number of 3 and Draw dotted lines on, will give you horizontal marks and horizontal dotted lines at -1, 0, and 1; choosing Marks bottom... with a number of 6 and Draw dotted lines off, will give you vertical marks at 0, 0.2, 0.4, 0.6, 0.8, and 1.
© ppgb 19970330