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<br />. <br /> <br />. <br /> <br />~300 <br />z <br />< <br />a: <br />250 <br /> <br /> <br />KEY: <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />500 <br /> <br />40.631 <br />------ 40,682 <br />---~ 40,691 <br />-- 40.640 <br />-- --- 40.600 <br /> <br />450 <br /> <br />. <br /> <br />400 <br /> <br />- <br /> <br />Q) 350 <br />.S? <br /> <br />.!: <br />- <br /> <br />. <br /> <br />200 <br /> <br />150 <br /> <br />. <br /> <br />100 <br /> <br />50 <br /> <br />----~ ~ <br />-\ <br />~ <br /> <br /> <br />. <br /> <br />2 4 <br />WATER DEPTH (infeet) <br /> <br />. <br /> <br />. Figure 3. Variation in signal strength of five radio transmitters at <br />various depths in the Green River at Sand Wash, Utah, July 10, 1978. <br /> <br />19 <br /> <br />. <br />