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Figure 3: B-Cervicothoracic Spine Field (Isocente1); C-Lumbosacral Symmetrical spine Field (isocentre2): Y1 and Y2are diverging edges of B and C fields respectively

Figure 3: B-Cervicothoracic Spine Field (Isocente1); C-Lumbosacral Symmetrical spine Field (isocentre2): Y1 and Y2are diverging edges of B and C fields respectively