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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />- l13 - <br /> <br />crystals and both air and ground observations indicated that they were fairly <br />rare. <br />Magono and Lee (1966) indicate that the most common two-branched crystal <br />has a separation of 1800 between the two branches. Rarely are two-branched <br />crystals with 600 or 1200 angle of inclusions observed. <br /> <br />Both air and ground observations indicated that two-branched crystals <br /> <br />are prone to break up in the air. <br />4,2,12 Dendritic: Crystal with Twelve Branches (P4b) <br />The air observations indicated that dendritic crystals with twelve <br />branches grow between -12 to -l70C under highly supersaturated conditions with <br />respect to ice. Although generally observed as individual crystals, they are <br />often embedded in aggregates both in the air and on the ground. They were <br />observed more frequently on the ground than in the air but this most likely <br />resulted from the sampling limitations of the continuous particle sampler. <br />These star-like crystals had all the irregularities associated with the <br />more common six-branched star-like crystals. The nature of their centers <br />varied from one crystal to another. Also, the lengths, widths, and shapes of <br />the branches varied within individual crystals. Most noticeable was the <br /> <br />difference in length of the branches. Nakaya (l954) noted that in many of <br /> <br />these crystals six alternate branches were slightly larger than the other <br /> <br />group of six between them. This alternation of length was not commonly seen <br /> <br />in the crystals observed by us in the air or on the ground. The twelve- <br /> <br />branched crystals observed in the air and on the ground were usually quite <br /> <br />large. In the air the crystals ranged in size from 1400 to 4500 ~m in <br /> <br />