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A thickened contour line carrying its height figure.
Also known as: Bold contour, Labelled contour, Master contour
Every fifth contour is drawn heavier and labelled with its height, so a reader can count from a known level rather than from the coast. The thickened line is a reading aid rather than a different kind of ground.
Marks every fifth contour with a heavier line and a printed height value, so elevations can be read without counting from sea level.
Contexts: Maps
Carries no meaning beyond the contour it already is: the weight of the line is a reading aid, not a statement about the terrain.
Contexts: Maps
A curved line drawn noticeably thicker than its neighbours, broken at one point to admit a printed number.
The same line drawn heavier and labelled.