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Figure 1: (a) Plot of cumulative dose volume histogram showing the dose received by [INSIDE:3] volume when planned at iso-centre (x0, y0, z0) and with shifts of x0+i and x0-i. (b) Plot of the variations in Dj(x0, y0, z0) due to couch translation shifts along the x direction and the corresponding fitted function f(x, vj)

Figure 1: (a) Plot of cumulative dose volume histogram showing the dose received by [INSIDE:3] volume when planned at iso-centre (x<sub>0</sub>, y<sub>0</sub>, z<sub>0</sub>) and with shifts of x<sub>0+i</sub> and x<sub>0-i</sub>. (b) Plot of the variations in D<sub>j</sub>(x<sub>0</sub>, y<sub>0</sub>, z<sub>0</sub>) due to couch translation shifts along the x direction and the corresponding fitted function f(x, v<sub>j</sub>)