Hi, I am having some 2d and 3d data files (from some nmr experiment, as a matter of fact) and the data plot for that is such that most of the points are coming together now I want to draw ellipse around 2d data point and ellipsoid around 3d data point with the condition that 90% (or any confidence interval) of data will fall inside it. Moreover, these ellipse / ellipsoid should have the minimum area/volume. How to do that can anyone advice me? I have been trying it in Matlab. But if any other software does this efficiently, kindly inform in details.