9.10. - zx close filter
tells the filter process that the current plot is finished.
zxIf the filter is associated with a printer,
zx will send the
current plot to the printer.
You generally use
zx to close a
filter after using
zw to keep it open.
On video terminals that maintain separate displays for text and for graphics,
zx is the recommended command for switching from text
to graphics in order to view an existing plot.
Typing a second
<return> will return the screen to text mode.