Westerhold et al., 2020 interpolated dataset presented at 1 point out
of 5 (or 8 Kyr step). The red line is a low-pass filter (window=64 points or
0.5 Myr). Data from S.M. Table S34. Top plot: δ18O.
bottom plot: δ13C. Please note that the "jump" at
about 34 Ma, the author define as "Oi=1 Glaciation", begins at the point
where the dataset's x-step changes from 2 Kyr to 5 Kyr (the authors say 4.4
Kyr), so the outlined "Eocene-Oligocene Transition" may be affected by this