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...ntil 2.15.1 (and probably all 2.15.x), specifying cex in plot.hclust changed the size of the plotted labels on each leaf. In 3.0.0 the character size remains the same irrespective of the cex setting. Since the help text for plot.hclust does not mention the cex argument, it is possible that an "undocumentde feature" was simply removed - but it was very useful when it was available. The following code illustrates the problem: data = c(1:20) dst = dist(data) tree = hclust(dst, method = "a") plot(tree, cex = 1) plot(tree, cex = 0.5) plot(tree, cex = 0.2) Under R-2.15 and earlier, the le...