Fig. 9. The TDR-scale _L–depth relationships for Case I (top, in red), Case II (middle, in green), and Case III (bottom, in blue). Observed _L distributions are given in black. Probes from Profile 1 are represented by open squares, Profile 2 with open circles, and Profile 3 with open triangles (see Fig. 1 for a description of probe locations). Error bars show the standard deviation due to flow rate.