Extended Data Figure 8: Distribution and density of hydroclimate proxy records.
From: Northern Hemisphere hydroclimate variability over the past twelve centuries
a, Number of contributing hydrological proxy records included in each proxy-centred anisotropic weighted mean calculation where there are three or more neighbouring proxies found in the search radius. b, Raw, centennial, hydroclimate proxy anomaly values derived from the data listed in Supplementary Table 1 and shown in Fig. 1a. Anomalies are shown relative to the centennial mean and standard deviation over the eleventh–nineteenth centuries. The colour scale is truncated at −2 and 2 and areas with insufficient proxy coverage to compute a gridded weighted mean value are left white.
