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Table I

Geographic origin (provenance region), habitat characteristics and leaf δ13C of 22 Juglans regia families, and details of the study site in Constantí.

Tmaxan= mean annual maximum temperature; Tminan= mean annual minimum temperature; Pan= annual precipitation; PETan= annual potential evapotranspiration; Pan/ PETan= ratio of annual precipitation to annual potential evapotranspiration; VPDan= annual mean of daytime vapour pressure deficit.