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Fitparameter α as a function of thermal dose given in addition to RT treatment. Thermal dose was calculated according to Equation (5) using the values of R calculated in Equation (13). The parameter roughly follows a linear increase with thermal dose. The fit was performed under the constraint of a constant value β as indicated in this figure. For all data sets the resulting coefficients of determination R2 were greater than 0.95 (survival curves are not shown).
