Contour Plotting

[DanKarron at UCBVAX.BERKELEY.EDU]

Does anyone have any source code to make isovalue contour plots in
2 D ? I need it for an 2d pixel density gizmo. My main concern is that
it make connected 2d lines over the entire region without missing any
spots that might contain an isolated short line segment.

Cheers!

dan.
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