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This Feb. 17, 2017, photo shows a Navy P-3 Orion aircraft used for a NASA-led experiment called SnowEx, on an airfield at Peterson Air Force Base in Colorado Springs, Colo. Instrument-laden aircraft are surveying the Colorado high country this month as scientists search for better ways to measure how much water is locked up in the world's mountain snows - water that sustains a substantial share of the global population. (AP Photo/Brennan Linsley)

This Feb. 17, 2017, photo shows a Navy P-3 Orion aircraft used for a NASA-led experiment called SnowEx, on an airfield at Peterson Air Force Base in Colorado Springs, Colo. Instrument-laden aircraft are surveying the Colorado high country this month as scientists search for better ways to measure how much water is locked up in the world's mountain snows - water that sustains a substantial share of the global population. (AP Photo/Brennan Linsley)

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