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The meaning of the color of the node varies based on the node attribute. In many cases, color just signifies membership to a human to human cluster. However, it could also represent health status (e.g. alive, dead), the sex of the patient, etc.  To generate a case tree plot, users provide a line listing with, at minimum: case ids, date of illness onset, and cluster membership. An example can be seen in \ref{tab:linelist}. table~\ref{tab:linelist}.  Any additional variables like patient age and sex may also be included, as can cases belonging to a cluster may be included, though they will not be represented in the plot. \begin{table}  \centering