Fig. 1.9.2 shows the dependence of A on rL/ro . Plotted as the ordinate in the Fig. 1.9.2 is A A min , where A min = (A)ri^ro = 3l2 ¡8ro , and as the abscissa is rL/ro = cp/(ZeHro). In the extreme cases the Eq. 1.9.19 gives
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