Denmark's longest and greatest river, the Gudenaa, certainly deserves study, so pulse tracer tests were run on various stretches of the river using radioactive Br-82. Find the axial dispersion coefficient in the upper stretch of the river, between Torring and Udlum, 8.7 km apart, from the following reported measurements.

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t, hr 3.5 3.75 C, arbitrary 0 3 25 102 281 535 740 780 650 t, hr 5.75 6 6.25 6.5 6.75 7 7.25 7.5 C, arbitrary 440 250 122 51 20 4 4.25 4.5 4.75 5 5.25 5.5 Data from Danish Isotope Center, report of November 1976. 9 3 0