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\section*{Results}  To generate a case tree plot, users provide a line listing with, at minimum: case ids, date of illness onset, and cluster membership. Cases not Any additional variables like patient age and sex may also be included, as can cases  belonging to a cluster mayalso  be included, though they will not be represented in the plot.Any additional variables like patient age and sex may also be included.  The line listing need not specify the chain of transmission; epipy will estimate the chain based on the onset dates. \begin{table}  \centering