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Change in average pixel ratio between the first and last data points at the MLC abutment position. The X axis shows the MLC abutment position (left 8 cm to right 8 cm with 2-cm interval) and the Y axis shows variation of the pixel ratio between first data and last data. Paired t-test comparisons between first data and last data are shown (P < 0.001: significant difference for every MLC abutment position).
