Thank you for the provided pictures.
Please, allow me to elaborate a bit on the ScatterSplineSeries and on the "spline" type series in general. Their idea is to smooth out the line connecting all the data points. They do that by creating a curve between the data points.
That said, currently there isn't any way to control the tension of the spline, however we do have a feature request for that in our feedback portal: ChartView: Ability to control the tension of the spline. You can vote for it in order to increase its priority.
I hope you find this information helpful.
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