Example 7.31: Contour plot of BMI by weight and height

April 5, 2010
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A contour plot is a simple way to plot a surface in two dimensions. Lines with a constant Z value are plotted on the X-Y plane.Typical uses include weather maps displaying “isobars” (lines of constant pressure), and maps displaying lines of constant elevation useful in, e.g., hiking. Unusual examples include maps of constant travel time, for example this map, which transforms space so that

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