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\section{Making a phylogram clock-like}
\paragraph{Making a tree clock-like}
Phylograms do not generally have aligned leaves, but it is possible to make a
tree clock-like with \luaed{} and \trim{}. Suppose we want to align all leaves
of the following tree to a depth of 7.5.
We can't use only \trim, because some branches are too short. We have to ensure
that all branches have a depth of \emph{at least} 7.5, then cut at that depth: