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note
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We thank I. Levin for providing a reference air tank along with calibrated isotope values. We thank T. Sowers and two anonymous reviewers for carefully reviewing the manuscript. Financial support for this study was provided in part by the German Secretary of Education and Research program GEOTECHNOLOGIEN, by Deutsche Forschungsgemeinschaft (DFG project MEPHISTO), Schweizerischer Nationalfonds (SNF project primeMETHANE), and the European Research Council advanced grant MATRICs. This work is a contribution to the North-GRIP ice core project, which is directed and organized by the Department of Geophysics at the Niels Bohr Institute for Astronomy, Physics and Geophysics, University of Copenhagen. It is supported by funding agencies in Denmark (SNF), Belgium (FNRS-CFB), France (IFRTP and INSU/CNRS), Germany (AWI), Iceland (Rannls), Japan (MEXT), Sweden (SPRS), Switzerland (SNF), and the United States (NSF).
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