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Geographical location of the 43 Picea glauca populations and the common garden trial (red star). Mean soil water availability in summer (SMI) for the period 1950–1980 is overlaid on the range‐wide distribution of P. glauca. The sampled populations represent provenances whose seeds were used to establish the common garden trial and are indicated by black circles. Population numbering corresponds to that found in Table S1
