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N2 fixation rates on surface seawater samples at Stn ALOHA incubated in deckboard incubators at 3 different light intensities for 24 h on two separate occasions: 20 July 2011 (A) and 27 September 2011 (B). The 15N2 tracer was either added as a gas bubble (open bars) or in dissolved form (gray bars). Error bars represent the standard deviation (n = 3).
