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

2 NUMBER OF VALID CARBON MEASUREMENTS IN NETWORK

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

4 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA

5 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA

6 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA

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

8

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

10 MEDIAN AND INTERQUARTILE RANGE ENTIRE NETWORK, ALL VALID DATA

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