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12.5-Ch-Fig-12.32.png

Figure 12.32 Reciprocal variation in atmospheric ozone over the South Pole (open symbols), and flavonoid content of the moss Bryum argenteum (solid symbols). Ozone concentration is indicated as Dobson units which represent the physical thickness of the ozone layer at a pressure of one atmosphere (e.g. 300 Dobson units = 3 mm). (Original data R.K. Markham)