How to control color of contour lines?

Sat May 27 13:45:27 EDT 2006

How do I get contour lines drawn in just one color (e.g. black)?

Multicolored contour lines on top of a pm3d surface can be very
hard to look at...

-- 
Grant Edwards                   grante             Yow!  Is it 1974? What's
                                  at               for SUPPER? Can I spend my
                               visi.com            COLLEGE FUND in one wild
                                                   afternoon??