Map of low oxygen levels during a July 20-21, 2011, cruise east of the Mississippi River, with hypoxia, levels between zero and 2 parts per million in bottom water, in red, outlined by the black line.

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Map of low oxygen levels during a July 20-21, 2011, cruise east of the Mississippi River, with hypoxia, levels between zero and 2 parts per million in bottom water, in red, outlined by the black line.