Fig. 3From: Distribution of surface heat flow and effects on the subsurface temperatures in the northern part of Thrace Basin, NW TurkeyPlot of the BHT data as a function of integrated thermal resistance of the overlying rock column (Bullard plot). The best-fit line in red color gives an average surface heat flow of 67 mW/m2 and extrapolated ground surface temperature 14.2 °CBack to article page