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Scanning spot positions of one energy layer (176.25 MeV) for pre-optimization (in panels [a], [d], and [g]), CSIO-optimized plans (in panels [b], [e], and [h]) and DSIO-optimized plans (in panels [c], [f], and [i]) with three different spot spacings (7mm, 5mm, and 3mm) for prostate cancer patient case 2.
