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With the normalization and geometry of Table 3.2, Case 6, with m2 = —4 for the Cassegrain form, (6s2)c¡ = —2.77778 and the additional term is +10.53498 giving

(bs2)sp,Cass = +7.75720 , as given in Table 3.2. From Eqs. (3.12) and (3.13), this corresponds to an oblate spheroid of high asphericity. As for the DK case, Eq. (3.138) can be transformed into the non-singular, general form for the afocal case

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