Fig. 6.

Linear fitting of tumor CI versus (a) fluence, (b) PDT dose, and (c) mean ${[{}^1{\mathrm{O}}_2]}_{\mathrm{rx}}$ at a 3-mm tumor depth in each group. The gray area in each figure shows the upper and lower bounds of the fit with 95% confidence level. The solid lines show the best-fit to the data using functional forms, $y=0.003x$ for (a), $y=0.001x$ for (b), and $y=0.795x$ for (c) with goodness of fit of $R^2=0.35$, 0.79, and 0.93 for (a), (b), and (c), respectively.