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Portable Network Graphic  |  1991-05-30  |  1KB  |  508x318  |  1-bit (2 colors)

Labels: text | screenshot | diagram | font
OCR: 60- parts per trillion 50 40 30 20 10- 0- 1984 1985 1986 1987 1988 Year Measured CFC-113 Levels

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