Extended Data Fig. 6: Power/Confidence heatmap plot for E-T-P solution + Noise.
From: Spatially variable response of Antarctica’s ice sheets to orbital forcing during the Pliocene
Pre-whitened power and confidence level (e.g., the confidence with which we can reject the null hypothesis that a spectral peak is produced by noise alone) identified via LOWSPEC analysis59. AR1 noise coefficient (ρ) is a measure of how correlated (or “red”) added noise is. O1 and P1-P2 frequency bands are readily identified with high confidence regardless of how “red” the added noise is. E1 and P3 bands are identifiable with moderately “red” noise. E2 is most affected by the addition of highly “red” noise, but it is still identifiable up to ρ=0.2-0.3. ρ=0.0 means non-autocorrelated “white” noise; ρ=1.0 means purely autocorrelated “red” noise.
