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SPLINE()                                                           T_EXAM13
   Draws a curved line through the points of a Y data column.

   Syntax
         SPLINE(nYColumn [,nType] [,nIncrement] [,nTension] [,nPixRes]
                [,nRndRes])

   Arguments
         nColumn     Sets the Y column number.

         OPTIONAL PARAMETERS
         nType 0 - Curve passes close to points.
               1 - Curve passes through the points.

         nIncrement - number of segments (default 0.05 or 20 segments)
                      other possible values:      0.10 or 10 segments
                                                  0.20 or 5 segments
                                                  0.01 or 100 segments

         nTension - used only for nType 1. The tension ranges from 0 to 1.0.
                    The tension factor controls the appearance of the curve.
                    If it is less than 0.5, the curve will be shorter in
                    length and bends at the control point will be tighter. If
                    greater than 0.5, the curve becomes looser and longer but
                    still passes through the control points. The ideal setting
                    for most purposes is a tension factor of 0.5.

         nPixRes - minimum pixels before segment is selected to draw.
                   (default 3)

         nRndRes - minimum rounded precision before the segment is
                   selected to draw. (default 0.2)

   Description
         SPLINE() with nType 0 draws a curved line through the points of a Y
         data column. The line is influenced by four control points nearest
         the present location on the curve. The result is a curve that is free
         flowing between two points.

         SPLINE() with nType 1 draw a curve through each point along the
         graph.

         Each point is calculated from an equation. The pixel position is
         rounded and can look wavy on a PostScript or HPGL device. nPixRes
         and nRndRes are available to attempt to smooth the curve by
         setting a minimum pixel distance with nPixRes and a maximum
         fractional amount above an integer value with nRndRes.