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Showing the relation between PCn′ calculated by Eq. (A4) and PCn. The slope has little influence on PCn except for a few cases. As will be shown, the slope accounts for only 12.75% of the variance in PCn, but only adds a 0.51% reduction in the variance in PCn accounted for by the upper asymptote and the inflection point. Although not shown, the steeper the slope the lower PCn.
