Figure 7.

The local dose errors as a function of dose for geometry 1 ($20\times 20\hspace{0.17em}{\text{cm}}^2$) (a), geometry 2 ($10\times 10\hspace{0.17em}{\text{cm}}^2$) (b) and geometry 3 ($5\times 5\hspace{0.17em}{\text{cm}}^2$) (c) on the different days. The local dose error means the dose difference relative to the true dose for the same pixel value.