140 DISTRIBUTION OF PARTICLES LESS THAN STATED SIZE T T 10" yl 10° _ 107} 4 lo" _ 1 1073 | 107 107! 1 PARTICLE DIAMETER, NUMBER OF PARTICLES NUMBER OF PARTICLES lot T 10° |— 4 107|— 4 To! ~ 1073 10! T | 10-? l 107! { ] PARTICLE DIAMETER, p Fig. $—Flights 2556, 2562, 2569, and 2572, August to October 1961, Minneapolis, Minn. Fig, 4—Flight 2611, October i962, Minneapolis, Minn. 10* 104 T | | 107 107! | 1 | ! 3 - R | es NUMBER OF PARTICLES NUMBER OF PARTICLES T 10! ] 107° PARTICLE DIAMETER, yw Fig. 5—Flight T-781-A, May 1963, San Angelo, Tex. 10! 1 1073 | i i 107? 107! 1 PARTICLE DIAMETER, Fig. 6—Flight T-796-A, June 1963, San Angelo, Tex. 10!

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