Estimated energy production and use in the United States. Lawrence Livermore National Laboratory produces a well-known sankey flow chart visualization of energy use. So, this seemed like a good example for demonstrating flow charts using C3.

# US Energy Use (Year:
)

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# UK Energy Use

The following example is similar, but uses energy data from the UK. This example has been used by other charting libraries, so it seemed useful as an example.

Add cycle / backedge (made up data)
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