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A contour line (also isoline or isarithm) of a function of two variables is a curve along which the function has a constant value. In cartography, a contour line (usually just called a “contour”) joins points of equal elevation above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which, according to how close or far apart each line is, shows the steepness of a slope. The contour interval of a contour map is the difference in elevation between successive contour lines.

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