Figure 6

δ¹⁸O versus δ²H of the thermal waters for all studied areas. The black solid line is the Global Meteoric Water Line, The blue dash-dot line is the Local Meteoric Water Line (δ²H = (8.7 ± 0.44)*δ¹⁸Ο + 19.5 ± 3.1) and the red dash line is the Meteoric Water Line of Thrace (δ²H = (7.39 ± 0.37)*δ¹⁸Ο + 7.9 ± 3.0).