FIGURE 1. Dome C CO2 data.
From the following article:
High-resolution carbon dioxide concentration record 650,000–800,000 years before present
Dieter Lüthi, Martine Le Floch, Bernhard Bereiter, Thomas Blunier, Jean-Marc Barnola, Urs Siegenthaler, Dominique Raynaud, Jean Jouzel, Hubertus Fischer, Kenji Kawamura & Thomas F. Stocker
Nature 453, 379-382(15 May 2008)
doi:10.1038/nature06949
Black solid circles connected by a grey line: data measured at Bern (mean of four to six samples); error bars represent 1
of the mean (s.d.). Red open circles: data measured at Grenoble (2 = 3 p.p.m.v.). Blue solid circles: Dome C CO2 data published by Siegenthaler et al.4. Green solid diamonds: control measurements with the sublimation extraction technique. The black arrow indicates a CO2 value of 339 
56 p.p.m.v. (s.d.), an artefact detected at a depth of 3,178.12 m (age: 783,040 yr bp). All data are plotted on the EDC3_gas_a age scale26. Glacial terminations are indicated using Roman numerals in subscript (for example TVIII); MIS denotes Marine Isotope Stage27.
