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MARK_SIZE()                                                        G_EXAM12
   Allows you to change the graph mark size.

   Syntax
         MARK_SIZE(nHorizontal,nVertical)

   Arguments
         nHorizontal    Sets the horizontal mark size.
         nVertical      Sets the vertical mark size.

   Returns
         MARK_SIZE(@nHorizontal,@nVertical)

   Description
         The nHorizontal and nVertical arguments allow you to change the
         size of the mark on the X,Y graphs. The standard mark size is 200
         horizontal by 150 vertical. This allows you to have a relative
         point size based on the resolution of the monitor. The smaller the
         number, the larger the point. The number of pixels for the point is
         calculated by dividing the horizontal or vertical resolution by the
         mark size. i.e. VGA: 640/200 = 3 pixels wide; 480/150 = 3 pixels
         high.