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                             TextHeight function

  DECLARATION:  TextHeight(TestString : String);

      PURPOSE:  Returns the height of a string in pixels

         UNIT:  Graph

  RESULT TYPE:  Word

      REMARKS:  The height of TextString, in pixels, is computed using
                the current font size and multiplication factor.  This
                can be used to adjust line spacing, sizing viewports, etc.

 RESTRICTIONS:  Must first be in graphics mode.
See Also: OutText OutTextXY SetTextStyle TextWidth
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