Plot of Plio-Pleistocene CO2
Adaptation of a figure created originally by the Foster Lab (National Oceanography Centre Southampton)
Original figure here: http://www.thefosterlab.org/blog/2015/11/11/is-this-the-last-year-below-400-ppm
Data from here: http://www.thefosterlab.org/blog/2015/11/17/data-and-r-script-for-plotting-400-ppm-figure
adapted for MATLAB by Kevin Anchukaitis, University of Arizona (http://www.u.arizona.edu/~kanchukaitis/)