k near a point magnifies the plot, keeping the center
at the point where you clicked. Holding the <kbd>Shift</kbd> key while
clicking, zooms out to the previous magnification.
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</li><li> <em>Dragging</em>.  Holding the right mouse button down while the
cursor is moved, the plot can be moved sideways or up and down.
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</li><li> <em>Save</em>. Can be used to save a copy of the plot in a Postscript
file.
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</li><li> <em>Help</em>. Will show a short s