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Example genealogy, drawn with branch lengths equal to the coalescent expectations, which shows the structure of the data analyzed here: “A,” “D,” and “O” are, respectively, samples that are only in the ascertainment set, samples that are only in the data set, and “overlap” samples (i.e., those which are in both the data set and the ascertainment set). Three types of branches are distinguished, corresponding to the three kinds of observable polymorphisms discussed in the text.
