Fig. 4
From: Genetic resources of common ash (Fraxinus excelsior L.) in Poland
Heterogeneity of genetic variation levels within phylogenetic gene pools Q1 (a, b) and Q2 (c, d) in terms of allelic richness (a, c) and expected heterozygosity (b, d). The bars show the (centered) mean ranks for populations, while the lines indicate the bootstrap confidence intervals (for different levels of significance) around the null hypothesis (no deviation from the mean value)