Fig. 2 a N2O concentrations (circles) and atmospheric equilibrium concentration (solid line) of Lake Grimsel on 9 October 2003. b N2O concentrations in Lake Lungern on 19 October 2005 (diamonds), 1 September (circles), 14 September (squares), and 21 September 2006 (triangles) and atmospheric equilibrium concentration (solid line) of Lake Lungern
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