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Composite ICSDs obtained in the five target voxels (2–6) and in the two normal tissue voxels (1 and 7) for the two-field proton plan with unit PB fluence. Left panel: absolute distributions (frequencies of zero clusters not shown). Right panel: conditional distributions. The voxel numbering scheme is the same as Figure 4. The legend box, in the right panel shows the M 1 ∗ values for each voxel.
