Source - http://www.personal.psu.edu/faculty/c/a/cab38/GEOG321/14_multivariate02/15_isoline.jpg
http://www.personal.psu.edu/faculty/c/a/cab38/GEOG321/14_multivariate02/multivariate.html
Isoline are used to represent points of equal values, the meaning of iso is equal. In this map above it uses lines to to tell the equal average of temperature isotherms. The lines are around 65, 60, 55. around the Caribbean and Florida. The pattern is that its gets cold the more you move up north.
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