How to Plot Stress in Clipped Section

Hello.

I would like to plot the stress distribution across a part cross section.  I used section clipping and drew a 3d line where I would like the stress to be plotted (see image 1), but cannot figure out how to produce a nice clean graph.

I can do a very rough version by probing the face at various points and then clicking the plot button - but the line is jagged because my points are not uniformly distributed (image 2).  I would like the program to automatically select a nice array of data points along the line I've defined - is this possible?

Thanks very much,

Andrew