Effect of perfusion distance on volume coagulation and coagulation diameters. Three values of perfusion distance were tested: 0 mm (n = 4), 2 mm (n = 5) and 4 mm (n = 6). Scatter plot shows non-linear (quadratic) relationship between distance and coagulation volume (A), maximum transverse diameter of coagulation (B), and minimum transverse diameter (C). Goodness of fit of the models is individually assessed by r2. Note the improved effect at 2 mm distance.