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97 Chap. 7 <br />U2 U U <br />2 <br />a ? <br />> a ? nc3t r 2 ?? ?-U <br />0" <br />In obtainin ; this result use has been node of the relation <br />2 <br />2 e-o do = 1.0 <br />0 <br />Then by substitution <br />2 2 <br />(x z <br />ff = - Iv- - fie + 414-at e ?+ rv 2 4s_e o du <br />2m a a <br />0 <br />or <br />2 <br />e du (7-3) <br />0 <br />Values of the integral shown here may be ..obtained from Table 8. _ken <br />r -* 0 f as at should- It wall appear later that a formula of this <br />eral type will hold for a point source, a line source of finite length <br />or a line source of infinite length. <br /> <br />