A chart-ready view of a band (variance envelope): the time axis plus a paired
lower/upper edge per sample. A sample is part of the filled band only
where both edges are finite; either edge NaN is a gap (the fill breaks,
it does not bridge — same contract as ChartSeries).
A chart-ready view of a band (variance envelope): the time axis plus a paired
lower/upperedge per sample. A sample is part of the filled band only where both edges are finite; either edgeNaNis a gap (the fill breaks, it does not bridge — same contract as ChartSeries).