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Definition of the four seat pan contact regions (PI to PIV) from the lateral pressure profile of pressure distribution. Xbeg is the first row that the buttocks contacting the sensor mat, Xend is the last row that the thighs contacting with the sensor mat Xmax is corresponding to the row of the peak pressure, Xmid1 the middle between Xmax and Xend, and Xmid2 the middle between Xmid1 and Xend.
