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Relative dose error (RDE) of dosimetric parameters for (a) individual PTV and (b) individual GTV, D99%, D95%, and D1% in ranges of RSE3D (RSE3D ≤ 2°, 2° < RSE3D ≤ 4°, and 4° < RSE3D) for multiple‐metastases cases by putting the isocentre‐target distance on the horizon axis. The ra, rb, and rc are the Spearman's rank correlation coefficients in the ranges of RSE3D ≤ 2°, 2° < RSE3D ≤ 4°, and 4° < RSE3D (*P‐value < 0.05, **P‐value < 0.01).
