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Figure 3. The natural logarithm of the surviving fraction (s) as a function of the imparted dose. {blacksquare}, results of the method used in this study; —, corresponding regression to the linear-quadratic model; -.-., results quoted by Villalobos et al [21] (•, 2 Gy dose); ..., linear-quadratic fit obtained by Núñez et al [28] ({diamond}, 2 Gy dose); {triangleup} and - - -, results corresponding to reanalysis of data of Villalobos et al [21]. Uncertainties correspond to one standard deviation.