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Fig. 2D —Placement of markers on phantom and patients. For selection order A, registration with four markers used markers 1, 2, 3, 8; five markers, 1, 2, 3, 8, 4; six markers, 1, 2, 3, 8, 4, 7; seven markers: 1, 2, 3, 8, 4, 7, 6; eight markers, 1, 2, 3, 8, 4, 7, 6, 5; nine markers, 1, 2, 3, 8, 4, 7, 6, 5, 9. For selection order B, registration with four markers used markers 1, 4, 5, 9; five markers, 1, 4, 5, 9, 8; six markers, 1, 4, 5, 9, 8, 3; seven markers, 1, 4, 5, 9, 8, 3, 10; eight markers, 1, 4, 5, 9, 8, 3, 10, 6; nine markers, 1, 4, 5, 9, 8, 3, 10, 6, 7. Graphic (C) and photograph (D) show placement of external markers on patient.