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Historic CH₄ Records from Antarctic and Greenland Ice Cores, Antarctic Firn Data, and Archived Air Samples from Cape Grim, Tasmania

• Digital Data (ASCII)
• Smoothed Southern Hemisphere and Global Methane Concentration Data, Spline Fit (ASCII)
• Digital Data (Excel spreadsheet)
• Smoothed Southern Hemisphere and Global Methane Concentration Data, Spline Fit (Excel spreadsheet)