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Excursion (cm) of lung tumor GTV (black) and fiducial centroid (gray) between end-exhalation and end-inhalation for the 24 patients included in the correlative models, (A) in X (left-right) direction, (B) in Y (anterior-posterior) direction, and (C) in Z (superior-inferior) direction. Abbreviations: AP = anterior-posterior; FID = fiducial centroid; GTV = gross tumor volume; LR = left-right; SI = superior-inferior.
