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Portable Network Graphic  |  1992-02-05  |  1.2 KB  |  512x342  |  1-bit (2 colors)
   ocr: 1.81 CH4 ppn, Antarctica,(B.stauffer) 1.4- 1.0- - 0.6+ 1700 1800 1900 2000 Year ETHANE LEVELS FROM ICE CORES & TODAY