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*** Delta C-13 values (per mil) derived from CO2 in flask air      ***
*** samples collected at Estevan Point, Canada                     ***
*** Source: C. E. Allison                                          ***
***              R. J. Francey                                     ***
***              P. B. Krummel                                     ***  
***              Atmospheric, Research, Commonwealth Scientific,   ***
***              And Industrial Research Organisation,             ***
***              Aspendale, Victoria,                              *** 
***              Australia  3195                                   ***                   
***                                                                ***   
*** September 2003                                                 ***
***                                                                ***
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	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Ann. Ave.

1993							-7.749	-7.509	-7.598	-7.916	-7.985	-7.929	
1994	-8.041	-8.132	-8.095	-8.082	-8.163	-8.078	-7.791	-7.573	-7.602	-7.844	-8.035	-8.1	-7.961
1995	-8.232	-8.302	-8.168	-8.051	-8.079	-8.043	-7.795	-7.662	-7.813	-7.967	-8.035	-8.057	-8.017
1996	-8.125	-8.174	-8.175	-8.227	-8.278	-8.185	-7.913	-7.638	-7.606	-7.831	-8.051	-8.134	-8.028
1997	-8.229	-8.269	-8.238	-8.292	-8.322	-8.129	-7.781	-7.566	-7.656	-7.921	-8.111	-8.154	-8.056
1998	-8.239	-8.328	-8.287	-8.282	-8.292	-8.162	-7.889	-7.639	-7.724	-8.039	-8.212	-8.251	-8.112
1999	-8.342	-8.388	-8.358	-8.396	-8.42	-8.242	-7.92	-7.678	-7.734	-8.013	-8.189	-8.207	-8.157
2000	-8.275	-8.356	-8.371	-8.376	-8.343	-8.236	-8.055	-7.832	-7.843	-8.123	-8.256	-8.226	-8.191
2001	-8.309	-8.371	-8.38	-8.418	-8.334	-8.167	-7.937	-7.682	-7.737	-8.053	-8.229	-8.26	-8.156


Monthly values (per mil) are reported on the international VPDB-CO2 scale. Monthly values were 
calculated as the mean of the daily values from a smooth curve fit to the data using the 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.