Fig. 3
a Positive correlation between observed convergent/parallel substitutions and expected convergent/parallel substitutions. b Positive correlation between observed convergent/parallel substitutions and observed divergent substitutions. A total of 74 pairwise comparisons are made (=74 data points). Lines present the best-fit lines and grey bands represent 95% confidence interval. Dashed line in (a) represents Rconv = 1 (observed convergent/parallel substitutions = expected convergent/parallel substitutions). All six high-altitude pairs are in solid circles