http://www.fao.org/docrep/003/t0446e/t0446e06.htm
Isopleths are lines in which connect equal values. This is the same concept in which topographic lines are based off. The maps above display isopleths this can be displayed by looking at the map on the top left in comparison to the bottom left. The top left map has no connecting lines due to its lack of equal values.
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