Fig. 4From: Survival of Douglas-fir provenances in Austria: site-specific late and early frost events are more important than provenance originMean survival of provenances originating from different altitudinal clusters (y-axis) plotted against mean survival rate of individual trials (x-axis). The three altitudinal clusters are: low (0–500 m), mid (500–1000 m) and high (1000–1400 m)Back to article page