Spline Band Series are provided by the SplineBandRenderableSeries type. This is a chart type which draws an area (polygon or fill) between two lines, using a spline interpolation (smoothing) algorithm. The SplineBandRenderableSeries requires an XyyDataSeries, which contains one X-point and two Y-points
Dual lines are drawn by the stroke, strokeY1 properties and shaded bands are drawn by the fill and fillY1 properties, depending on whether y1 is greater than y2
If you have data where Y1 is greater than Y2 always, you’ll get an envelope effect. Great for rendering confidence intervals, error margins or Bollinger Bands!
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