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MLC-leaf speed analysis. (a) Distribution of the MLC-leaf speed for the 2-D displacement (solid line), the deformable 2-D displacement (dotted line), and the deformable 2-D displacement combined with rotation (dashed line). (b) MLC-leaf speed versus positional deviation of the MLC leaves. The higher the MLC-leaf speed, the larger is the positional deviation of the leaves.
