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\label{survival_curves}: \label{survival_curves}  LEM-AM clonogenic survival predictions and observed experimental results \cite{Jain_2011} for MDA-MB-231 breast cancer cell exposed to 160 kVp, 6 and 15 MV: full bullets, with gold; empty bullets, control. The control cell response curve was fitted through the linear-quadratic (LQ) model.