Editing Gall–Peters projection (section)

===Relation to cylindric equal-area projections===
The various specializations of the cylindric equal-area projection differ only in the ratio of the vertical to horizontal axis. This ratio determines the ''standard parallel'' of the projection, which is the parallel at which there is no distortion and along which distances match the stated scale. The standard parallels of the Gall–Peters are 45°&nbsp;N and 45°&nbsp;S. Several other specializations of the equal-area cylindric have been described, promoted, or otherwise named.<ref name="Snyder2">Snyder, John P. (1989). ''An Album of Map Projections'' p. 19. Washington, D.C.: U.S. Geological Survey Professional Paper 1453. (Mathematical properties of the Gall–Peters and related projections.)</ref><ref name="Monmonier">Monmonier, Mark (2004). ''Rhumb Lines and Map Wars: A Social History of the Mercator Projection'' p. 152. Chicago: The University of Chicago Press. (Thorough treatment of the social history of the Mercator projection and Gall–Peters projections.)</ref><ref name="Smyth">Smyth, C. Piazzi. (1870). ''On an Equal-Surface Projection and its Anthropological Applications''. Edinburgh: Edmonton & Douglas. (Monograph describing an equal-area cylindric projection and its virtues, specifically disparaging Mercator's projection.)</ref>