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Interannual variations of year-long water body area, GRACE LWS, and annual precipitation during 1984–2016 in California (A), Kansas (B), Oklahoma (C), and Texas (D). The dashed pink box indicates documented drought events, including 1986–1992, 2007–2009, and 2012–2015 droughts in California; 2006 drought in Kansas, Oklahoma, and Texas; 2011–2012 drought in Oklahoma and Texas; and 2012 drought in Kansas.
