Fig. 6
![Fig. 6](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13014-016-0642-6/MediaObjects/13014_2016_642_Fig6_HTML.gif)
RBE distributions for patient 1 (upper panels) and patient 2 (lower panels) are shown for (α/β) x = 2 Gy and variable RBE applying the three biological models (left: LEM, middle: Carabe, right: Wedenberg). PTV and OAR contours are depicted with lines