Outer edges on a patch surface

Hi I have a patch surface like this, which is a stack of isosurfaces at different levels.

I want to draw the oultines of these surface so that each surface can be differentiated from the other a bit better.

Answer 1

[Star Strider]

One option could be contour3.

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Answer 2

[Xin Yee Tai]

Extract the edge value from your dataset (X,Y,Z) and then use plot3 and 'hold on' to plot the line.