A range area chart fills the band between a low and a high value at each point - a natural fit for things like daily temperature ranges, price bands, or confidence intervals.
When each point has two bounds rather than one value - forecast ranges, min/max bands, or uncertainty around an estimate - and you want the spread shown as a filled band.
Each point needs a category or date plus a low and a high value, mapped to the low and high properties of the range area series.
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