Fig. 4

D98 plotted against clavicle rotation for the breast and chest wall CTV (left figure) and for axillary lymph node level 1–2, axillary lymph node level 3–4, axillary lymph node level 1–4, and IMN CTV, per treatment fraction. A correction for the left and right arm was applied, hence a positive value of the clavicle rotation refers to an arm position that was too low, while a high arm position is represented by a negative value