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<br />TABLE 1 <br /> <br />, <br /> <br />Time of arrival of the wave front <br /> <br />U1Hance r., = U r~ = U.oU I' = U.UlJ <br />X x Fn fn In = 0.20 <br />miles 0.10 0.50 0.20 0"10 0.50 0.20 tw tw, hr <br />6.00 0.368 0.25 0.375 0.281 0.22 0.28 0.235 0.255 0.58 <br />8.15 0.5 0.40 0.50 0.425 0.36 0.40 0.370 0.395 0.90 <br />16.30 1.0 1.02 1.20 1.065 0"95 1.00 0"962 1.008 2.28 <br />24.45 1.5 1.80 1.90 1.825 1.65 1.75 1"675 1.742 3.94 <br />32.60 2.0 2"65 2.85 2.700 2.43 2.60 2"472 2"573 5.83 <br />48.90 3.0 . 4.65 4.875 4"706 4.12 4.30 4.165 4"405 9.98 <br /> <br />. <br /> <br />9 <br />