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HORZ_LINE()                                                        G_EXAM12
   Draws a horizontal reference line parallel to the X axis.

   Syntax
         HORZ_LINE(nYValue [,nColor] [,nPattern])

   Arguments
         nYValue     Sets the Y axis scale value at which to draw the line.
         OPTIONAL PARAMETERS
         nColor      Color of the horizontal line. (default 15)
         nPattern    Pattern of the horizontal line. (default 1)

   Description
         HORZ_LINE() draws a horizontal reference line on the screen at a
         position parallel to the X axis. The pattern for the line can be
         set with nPattern, and the color can be set with nColor.