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Figure 3.3 The diagonal approximation to the admittance integral.
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integral constituting the numerator of J becomes restricted to close to the diagonal z=z' of the
area of integration (0<z<H,0<z'<H), so that the numerator double integral is well
approximated by (Davenport, 1962). This approximation is illustrated by Figure
3.3, using for clarity the ‘straight line’ weighting function
An ‘effective size’ He can be defined by the quotient of integrals
(3.16)
