Fig. 3.

Cross-wavelet coherences. Notes: Time appears on the x-axis, while frequency on the y-axis. The cone of influence (COI) where edge effects should be considered is shown with a parabola-like lighter shade. The thick black line contours designate the 5% significance level. The color code for R²(u,s) ranges from blue (low coherency: R² close to 0) to yellow (high coherency: R² close to 1). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)