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BEQENE CONCENTPATION US"TIME - <br /> ru-3 <br /> 45 —� <br /> 40 MW-3 <br /> Z-. <br /> 35 <br /> 0 5p <br /> Q <br /> 2 25 <br /> z <br /> ..-0 20 - <br /> U <br /> w 15 <br /> z <br /> w <br /> z 10 <br /> w <br /> m <br /> 5 <br /> 06/16/87 04/27/88 08/02/89 <br /> 10/07/87 07l_26/88 04/22/90 <br /> SAW[Jkd DATES <br />