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Figure S1 Evolution of the 2-, 6-, 12- and 24-month-long standardized precipitation–evapotranspiration index (SPEI) drought index over the period 1945–2006 in the Pratomagno range of the Appenine Mountains (Italy).

Figure S2 The detrending procedure did not modify the correlations (colour scale) obtained between tree-ring width indices and standardized precipitation–evapotranspiration index (SPEI) at different monthly time-scales (x-axis).

Figure S3 Cumulative and relative (percentages) variances of the principal components (PC) obtained by principal components analysis (PCA).

Figure S4 Spatial distribution of the loadings of the (a) third, (b) fourth, (c) fifth and (d) sixth principal components (colour scales) of the principal components analysis applied to the correlations calculated between the tree-ring width indices and different standardized precipitation–evapotranspiration index (SPEI) monthly time-scales.

Table S1 Percentages of tree families corresponding to the most representative groups of growth responses to drought determined by a principal components analysis.

Table S2 Percentage of tree species included within the groups corresponding to the main principal components (PC1, PC2 and PC3) obtained using a principal components analysis (PCA) based on the correlations calculated between the tree-ring width indices and different standardized precipitation–evapotranspiration index (SPEI) monthly time-scales.

Appendix S1 Supplementary figures and tables.

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