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Map showing (a) North America, where 
represents the state of Minnesota (Map Source: Google Maps); (b) Lake Steiger, the study site, and surrounding lakes (Map source: Google Maps); (c) Bathymetric and contour map of Lake Steiger (http://www.dnr.state.mn.us/lakefind/lake.html?id=10004500) depth contours are in five foot (~1.5 m) intervals
