This dataset includes the raw data corresponding to the calibrated hourly averages for the five "Ring 2" 
Mid Continent Intensive tower CO2 mole fraction sites published in 
Miles, N.L., S.J. Richardson, K.J. Davis, A.E. Andrews, T.J. Griffis, V. Bandaru, and K.P. Hosman. 2013. 
NACP MCI: Tower Atmospheric CO2 Concentrations, Upper Midwest Region, USA, 2007-2009. ORNL DAAC, Oak Ridge, 
Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1202.