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*** Atmospheric CO2 concentrations (ppmv) derived from flask air   ***
*** samples collected at Estevan Point, Canada                     ***
*** Source: L.P. Steele                                            ***
***              P.B. Krummel                                      ***  
***              R. L. Langenfelds,                                ***
***              Atmospheric, Research, Commonwealth Scientific,   ***
***              And Industrial Research Organisation,             ***
***              Aspendale, Victoria,                              *** 
***              Australia  3195                                   ***                   
***                                                                ***   
*** August 2007                                                    ***
***                                                                ***
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Month	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Ann. Ave.
1993							354.35	349.51	350.74	357.12	358.97	357.98	354.78
1994	360.11	362.23	362.49	362.20	362.63	361.02	356.48	352.64	352.71	357.35	361.47	362.61	359.50
1995	364.94	366.72	365.96	365.81	365.67	362.54	356.96	352.75	354.47	359.59	362.23	363.54	361.77
1996	365.56	365.50	364.96	366.17	366.88	365.23	360.80	355.71	354.96	359.65	363.68	364.93	362.84
1997	367.21	368.31	367.37	368.02	368.58	365.11	358.87	355.13	356.96	361.97	365.47	366.44	364.12
1998	367.89	369.15	368.74	369.40	369.87	367.21	362.42	358.48	359.95	365.69	369.29	369.94	366.50
1999	371.54	372.98	372.68	373.16	373.69	370.37	364.45	359.91	360.90	366.77	370.36	370.52	368.94
2000	372.10	373.86	374.06	374.27	373.63	371.58	369.14	365.93	365.31	370.10	373.90	373.41	371.44
2001	374.78	376.23	376.04	376.70	375.10	371.75	368.31	363.95	364.18	370.41	374.51	375.34	372.28

Monthly values are expressed in parts per million (ppm) and reported in the WMO CO2 
Mole Fraction Scale (Zhao et al., 1997, J. Geophys. Res. 102 , 5885-5894). Calibration 
details are discussed by Francey et al. (2003).  Monthly values are calculated as the 
mean of the daily values from a smooth curve fit to the data using curve-fitting 
routines described by Thoning et al., 1989, (J. Geophys. Res. 94, 8549-8565). 
Annual values are the arithmetic means of the 12 monthly values.