B-Spline

Use the Database Tools > Filters > B-Spline menu option (BSPLINE GX) to calculate a B-spline interpolation of data in a channel. A B-spline enables you to control the smoothness of the spline and the tension applied to the ends of the spline.

B-Spline dialog options

Channel to spline	Name of the channel to spline. Script Parameter: BSPLINE.IN
Output channel	Output splined channel (may be same as input) : The name the output splined channel. Script Parameter: BSPLINE.OUT
Smoothness (0.0 to 1.0)	Smoothness (0.0 to 1.0): This controls how well the splined line honors the data. A smoothness of 0.0 will honour the data exactly, while a smoothness of 1 results in an almost linear interpolation. Script Parameter: BSPLINE.SMOOTH
Tension (0.0 to 1.0)	Tension (0.0 to 1.0) This controls the amount of curvature in the interpolation in the vicinity of data points. A tension of 0.0 will result in a minimum curvature interpolation, while a tension of 1.0 produces a piecewise linear interpolation. Script Parameter: BSPLINE.TAU