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Fig. S1. Left. Calibration of the IRMS with a pure methane standard (100%). The squares show the measured δ13C-values. The triangles mark the calculated regression. The circles illustrate the corrected δ13C-values multiplied by the correction factor of 2.1186. The dotted line shows the regression.

Right. Calculation of the 13C-proportion (%) from the measured δ13C-values. The squares show the 13C-proportion (%) calculated from the corrected δ13C-values.

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