Fig. 4: Spectral analyses on the simulated and reconstructed global ice volume changes.
From: A gradual change is more likely to have caused the Mid-Pleistocene Transition than an abrupt event
Spectral analyses for the 1-0 Ma (a) and 2-1 Ma (b) time intervals for the ORB (dark), ABR (blue), and GRAD (green) simulations and the global ice volume reconstruction of ref. 41 (red).
