@subsubheading Description

Atmospheric concentrations of CO2 are expressed in parts per million (ppm) and
reported in the preliminary 1997 SIO manometric mole fraction scale. Contains
monthly observations from 1959 to 1997.

@subsubheading Format

@table @code
@item date
Date of the month of the observation, as datetime.
@item co2
CO2 concentration (ppm).
@end table

@subsubheading Details

The values for February, March and April of 1964 were missing and have
been obtained by interpolating linearly between the values for January
and May of 1964.

@subsubheading Source

Keeling, C. D. and Whorf, T. P., Scripps Institution of Oceanography
(SIO), University of California, La Jolla, California USA 92093-0220.

@url{ftp://cdiac.esd.ornl.gov/pub/maunaloa-co2/maunaloa.co2}.

@subsubheading References

Cleveland, W. S. (1993). @code{Visualizing Data}. New Jersey: Summit Press.

@subsubheading Examples

@example
@INCLUDE_DATASET_EXAMPLE_SCRIPT{co2_1.m}
@end example
