Contour map of 3D surface.

This image features a 3D surface plot combined with a contour map projection on the xy-plane. The surface plot demonstrates a multivariable function with peaks and valleys, rendered using a color gradient to emphasize changes in elevation. Below the surface, the contour map provides a top-down view of the function, marking the same peaks and troughs as level curves.

This illustration is ideal for calculus textbooks and advanced mathematics courses.

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Network Graphics / Division of Abramson & Wickham Graphics Inc.
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