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Weekly 3D trajectories of the gross tumor volume center of mass during respiration for two patients (Figure 6 from Britton KR, Starkschall G, Tucker SL, et al. Assessment of gross tumor volume regression and motion changes during radiotherapy for non‐small‐cell lung cancer as measured by four‐dimensional computed tomography. Int J Radiat Oncol Biol Phys. 2007;68:1036–1046)
