Fig. 7
From: Tree growth is more limited by drought in rear-edge forests most of the times
Moving window correlations calculated by relating mean site series of ring-width indices and the July SPEI drought index at 1-, 3-, 6-, 9-, 12-, 15-, 18-, and 21-month temporal resolutions (y axes). Moving correlations were obtained for 30-year intervals shifted by 1 year and the middle year of the interval is shown in x axes for each species (a, Pinus uncinata; b, Abies alba; c, Fagus sylvatica; d, Pinus sylvestris; e, Quercus robur; f, Quercus petraea). The colour scale shows the Pearson correlation coefficients