Set default `magnitude` on `frequentInterval` When only one item is in the graph, the `_frequentInterval` function returns an object without a magnitude, and `barWidth` returns `NaN` as a result.
Set default `magnitude` on `frequentInterval`
When only one item is in the graph, the `_frequentInterval` function
returns an object without a magnitude, and `barWidth` returns
`NaN` as a result.

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