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\subsection*{Checkerboard plots}  We have also developed a second visualization, the checkerboard plot, to complement case tree plots. Checkerboard plots, seen in \label{fig:check}, show how cases in human to human clusters have arisen over time. They can be used in conjunction with case tree plots, or in situations where representing a hypothetical network structure is inappropriate. Checkerboard plots have the added benefit of showing each case's unique identifer, identifying number,  to more easily connect the visualization to the line listing. list.  Each colored block represents a case in the cluster; the first and last cases in each cluster are labelled with their respective case identifiers, so they may more easily be found on the line list. Like case tree plots, the placement of each colored block along the x axis corresponds with the case's date of illness onset or diagnosis. Cases in the same cluster that had onset dates close to each other may overlap. The plot can be generated using the same line listing as described for case tree plots.