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A [[conformal line]] of a map projection on which the [[principal scale]] is conserved. Along a standard line the [[Tissot's indicatrix]] are circles with unit radius. In cylindric and conic projections, and for a spherical model of the Earth, the standard lines are circles. Examples of standard lines: [[standard parallel]]s in normal cylindric and conic projections; [[central meridian]] in transverse cylindric projections.

== See also ==
[[Conformal line]]<br/>
[[Equidistant line]]