Extended Data Fig. 1: Covariation between δO2/N2 and δAr/N2.
From: Early Pleistocene East Antarctic temperature in phase with local insolation
a, Dome Fuji (clathrate N = 219, r2 = 0.52; bubble N = 238, r2 = 0.82); b, Dome C (clathrate N = 40, r2 = 0.68; bubble N = 29, r2 = 0.66); c, S27 (N = 24; r2 = 0.38; and d, discontinuous Allan Hills ice (N = 92; r2 = 0.68). Correlation in all samples regardless of gas preservation status are significant at p = 0.05 level (two-tailed). Part of this covariation is modulated by insolation. Clathrate- and bubble-based gas data are shown in black and red circles, respectively. Dashed lines represent 95% confidence interval of the slope. All of the Allan Hills samples only contain bubbles.
