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Figure 2

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Principal components (PC1 and PC2) calculated on the climatic variables measured during cell enlargement and wall thickening and lignification in xylem of black spruce and balsam fir. The climatic variables included in the analysis are precipitation (P), humidity (H), number of days with precipitation (DP), mean air temperature (T), maximum air temperature (T +), minimum air temperature (T −), temperature under cover (TC), global radiation (R), water in soil (WS).

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