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*** Atmospheric H2 concentrations (ppbv) derived from flask       ***
*** samples collected at Estevan Point, Canada                     ***
*** Source: L.P. Steele                                            ***
***              P.B. Krummel                                      ***  
***              R.L. Langenfelds                                  ***
***              Commonwealth Scientific,                          ***
***              and Industrial Research Organisation,             ***
***              Aspendale, Victoria,                              *** 
***              Australia  3195                                   ***                   
***                                                                ***   
*** March 2003                                                     ***
***                                                                ***
**********************************************************************

Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Ann. Ave.

1993							518.78	509.01	484.24	466.71	481.55	499.77	
1994	499.26	497.81	499.62	504.76	512.68	515.96	514.59	503.85	483.91	473.76	478.25	486.12	497.55
1995	493.38	500.63	510.62	513.97	512.79	519.61	520.14	506.27	489.39	477.26	480.76	497.74	501.88
1996	513.68	521.84	520.21	516.45	522.01	530.12	530.46	512.75	484.97	477.15	488.46	503.51	510.13
1997	516.9	522.42	524.88	531.77	539.35	536.93	523.5	511.92	501.12	493.37	494.1	497.3	516.13
1998	506.26	515.08	523.18	528.83	528.9	529.99	530.96	523.53	509.37	497.47	499.74	514.89	517.35
1999	524.69	527.86	538	547.74	549.14	543.27	523.45	495.94	482.62	484.25	492.48	507	518.04
2000	518.04	522.64	524.83	527.47	532.92	533.64	530.27	529.64	513.83	486.5	486.38	498.25	517.03
2001	503.88	509.18	512.72	517.3	521.49	528.29	537.35	520.92	493.27	485.39	486.12	497.23	509.43

Monthly values are expressed in parts per billion per volume (ppbv) and reported in the CSIRO94 H2 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.