New a worksheet, import Group.dat under \\Samples\Graphing folder.

Highlight all, select plot: statistical: grouped marginal plot...

Set main layer as kernel density contour fill, click ok.

Click green lock and select change parameter, do nothing change, click ok.
==>plot in main layer is changed, in set levels dialog,To value is changed from 0.0053 to 0.0159. increment is changed from 5.75E-4 to 0.0019