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Portable Network Graphic  |  1991-05-30  |  1KB  |  386x278  |  1-bit (2 colors)

Labels: text | diagram | plot | line | font
OCR: 1.84 CH4 ppm, Antarctica, (B. Stauffer) 1.4- 1.0- 0.64 1700 1800 1900 T 2000 METHANE LEVELS FROM ICE CORES & TODAY Year

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