Fig. 3: The proxy data (Si/Al) and instrumental data (IVT) during the calibration period.

a The graph shows variation in Si/Al with age uncertainty bands; the median estimate is shown as a solid black line and the 50 and 95% highest probability density regions are shown in dark and light gray. b The graph shows the calibration-in-time predictand where the y-axis is annually summed IVT (kg m−1 s−1) and binned at a 5-year interval.