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David M. Winker, Mark A. Vaughan, Ali Omar, Yongxiang Hu, Kathleen A. Powell, Zhaoyan Liu, William H. Hunt, and Stuart A. Young

satellite attitude was controlled to point CALIOP 0.3° from geodetic nadir in the forward along-track direction. This small off-nadir angle avoids strong specular lidar returns from still water (e.g., ponds and rivers). In November 2007, the nadir angle was increased to 3° to reduce specular returns from clouds containing horizontally oriented ice crystals, which contribute to retrieval uncertainties. Two other space lidars have provided atmospheric measurements prior to CALIOP. The Lidar In

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