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1 COMPOSITION TRENDS ACCORDING TO TOR, 1990 - 2007 WHW, 10/30/07 updated 1/23/08

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2 NUMBER OF VALID CARBON MEASUREMENTS IN NETWORK

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3 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA seasonal norm = median of all 1990-2007 daily network medians in given month

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4 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA

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5 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA

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6 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA

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7 DE-SEASONALIZED EC/TC M = median of all 1990-2007 daily network medians in given month A = median of the twelve M. SCALE EXPANDED BY 50%

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8

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9 1 1/2 2 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA

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10 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA

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11 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA 12/95 5/96: exactly two PESA batches presume miscalibration 1 1.5 2 3 mol/mol