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Depth distribution of total in situ gas pressure (A and B) and conductivity (C and D) in Lakes Nyos (A and C) and Monoun (B and D) over time [1992 = black squares; 1998 = green diamonds; 2001 (Nyos) and 2003 (Monoun) = just before degassing, red triangles; 2004 = postdegassing, blue circles]. The gas saturation line (total hydrostatic plus atmospheric pressure) indicates the bubble-point pressure at which dissolved gas will form bubbles.
