Extended Data Fig. 1: Sensitivity plots for Fig. 2.
From: No evidence for globally coherent warm and cold periods over the preindustrial Common Era
Coloured areas show global area fractions (as percentages) with warm (red shading) and cold (blue shading) temperature anomalies with respect to the reference period 1–2000 ad (see Methods). a, Annual unfiltered data; b, 51-year butterworth filtered data, over the full ensemble. (Whereas Fig. 2 shows the mean area fractions of the six reconstruction ensemble medians, this figure displays the fraction over all ensemble members and locations.) Like the weak spatial coherence seen in Figs. 3, 4, this ensemble-based illustration shows much weaker spatial coherence (lower percentages) than does Fig. 2. c, As for Fig. 2b, but for 101-year filtered data instead of 51-year filterd data.
