Calculates a cross section value along a 2D dataset. Section values will be plotted as a curve. The function will create a new page to do this. When the function is called up, a dialog box will appear in which the projection parameter and a 2D dataset must be chosen. Projection: On x-axis, on y-axis, along curve length. The cross section values can be projected on the x-axis, the y-axis or plotted along the curve length of the dataset.