The chord flow chart also shows the number of objects making each possible state transition in the query data. As with the Sankey flow, the X column should identify a unique object, the Y column is a value than can be used to order the progress of the object, such as a time, and the Category column identifies the states, such as process steps.

In the chart, the states are shown as arcs around the edge of the circle. Each flow between pairs of states is shown as a curved area going between the two states, with the arc length of the flow at each end indicating the number of transitions in the data coming from the state to the other. Hover or click each flow to show the two states and the count of objects making that transition in either direction.