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<br />100 <br /> <br />80 <br /> <br /> <br />- SIMPLE CHANNEL <br />_ COMPLEX CHANNEL <br /> <br />~ <br />"if!. <br />'-' <br /> <br />b <br />z <br />w <br />=> <br />o 40 <br />W <br />a: <br />u. <br /> <br />20 <br /> <br />USED <br />SPRING <br /> <br />AVAILABLE USED <br /> <br />AVAILABLE USED <br /> <br />SUMMER <br /> <br />WINTER <br /> <br />fl~!!!!_~ (from Osmundson and Kaeding, 1991) <br /> <br />4 <br />