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this function is only used internally by the function draw.map
mercatorlat(x)
numeric: latitude to draw a mercator map
latitude in decimal coordinates
Fraenzi Korner-Nievergelt
Rummler, H. (2002) Mercatorkarte und hyperbolische Geometrie. Elem. Math., 57, 168-173.
mercatorlat(41.6)
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