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*** Atmospheric CH4 concentrations (ppbv) derived from flask       ***
*** samples collected at Estevan Point, B.C., Canada               ***
*** Source: L.P. Steele                                            ***
***              P.B. Krummel                                      ***  
***              R.L. Langenfelds                                  ***
***              Commonwealth Scientific,                          ***
***              and Industrial Research Organisation,             ***
***              Aspendale, Victoria,                              *** 
***              Australia  3195                                   ***                   
***                                                                ***   
*** January 2003                                                   ***
***                                                                ***
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Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Ann Ave

1993							1743.1	1756.49	1780.63	1794.61	1790.31	1784.92	
1994	1787.11	1793.64	1801.65	1799.04	1792	1778.42	1761.25	1768.95	1792.29	1800.95	1798.95	1802.97	1789.77
1995	1798.33	1793.57	1803.76	1808.97	1800.05	1783.89	1775.54	1787.4	1802.64	1809.42	1807.89	1803.75	1797.93
1996	1797.98	1794.59	1800.91	1807.35	1800.69	1781.76	1768.4	1776.49	1793.76	1802.51	1807.92	1811.12	1795.29
1997	1804.55	1803.6	1809.84	1807.86	1798.72	1789.64	1779.63	1775.9	1789.09	1801.57	1806.23	1810.58	1798.10
1998	1815.44	1818.89	1820.1	1821.13	1814.47	1798.76	1790.89	1804.1	1826.24	1835.83	1833.79	1831.3	1817.58
1999	1832.46	1834.88	1833.62	1828.55	1820.11	1804.45	1787.38	1788.83	1809.77	1820.19	1821.55	1819.78	1816.80
2000	1817.49	1823.15	1827.62	1826.37	1819.86	1805.68	1782.38	1766.81	1784.73	1817.66	1828.01	1824.99	1810.40
2001	1829.32	1831.22	1829.52	1828.06	1819.95	1805.03	1781.82	1783.04	1812.17	1824.79	1824.24	1826.7	1816.32

Monthly values are expressed in parts per billion by volume (ppbv) and reported in the CSIRO94 CH4 Scale 
[Steele, et al., 1996, pp. 107-110, in: Baseline Atmospheric Program (Australia) 1994-95, edited 
by R.J.Francey, A.L. Dick, and N. Derek]. 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.