Figure 3.
The surviving fraction of cells irradiated with 18 Gy as a function of relative partial oxygen pressure for FLASH (circles) and CONV (squares) irradiations, together with the linear quadratic fit (solid lines). Error bars indicate the range of data from the three separate experiments, bold markers the average surviving fraction, and asterisks indicate data below our detection limit. The relative sparing effect of FLASH (i.e. the ratio between the surviving fractions for FLASH and CONV), as calculated from the fitted curves, is also shown, with its lines becoming dashed where the model extrapolates the data.