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is an option for graphics functions which gives a list of graphics primitives to be rendered before the main part of the graphics is rendered.
  • Graphics primitives specified by Prolog are rendered after axes, boxes and frames are rendered.
  • In three-dimensional graphics, two-dimensional graphics primitives can be specified by the Prolog option. The graphics primitives are rendered in a 0,1 coordinate system.
  • Directives specified by Prolog affect only the prolog, and not other contents of a graphic.
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