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Portable Network Graphic  |  1991-05-30  |  2KB  |  512x342  |  4-bit (3 colors)
Labels: text | diagram | line | screenshot | font | plot
OCR: 1.8- CH4 ppm, Antarctica, (B.Stauffer) 1.4 1.0- 0.6 T 1700 1800 1900 2000 METHANE LEVELS FROM ICE CORES & TODAY Year