contour map]] A contour line (also level set, isopleth, isoline, isogram or isarithm) for a function of two variables is a curve connecting points where the function has a same particular value. A contour map is a map illustrated with contour lines, for example a topographic map. The prefix iso-, from the Greek prefix ???? ("equal"), is used from descriptive names for map lines that join points of equal value. Most everyday use of the term is in cartography. A contour map (topographic map) uses contour lines (often just called a "contour") to join points of equal elevation (height) and thus show valleys and hills, and the steepness of slopes. More generally, a contour line for a function of two variables is a curve connecting points where the function has a same particular value. The prefix iso-

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