This method is used for resampling with use of Polynomial Interpolation.
Polynomial Interpolation is a method to estimate data value (y) at a point (x) using four neighboring data,
(x1, y1), (x2, y2), (x3, y3), (x4, y4) as follow;
Select data you want to apply this method in Analysis Window and click the icon of By Polynomial Interpolation. This will display a dialogue box for sampling setting as shown in the below. Input sampling values as you want and click Apply button. Then, you can get data resampled from sampling values you set. Since interval available to resampling is presented in this dialogue box, you can conduct resampling within this interval.