Displays the monthly atmospheric concentrations of CO2 expressed in parts per million by volume (ppmv) for the years 1958 through 2000. Values are reported in the 1997 SIO manometric mole fraction scale. Missing values are denoted by -99.99. In years where one monthly value is missing, annual values were calculated by substituting a fit value (4-harmonics with gain factor and spline) for that month and then averaging the twelve monthly values.
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