DADevi Aruna Maharasi Murugan Syncfusion Team February 15, 2017 12:49 PM UTC
Thanks for contacting Syncfusion Support.
Currently we have rendered SplineSeries of SfChart with natural spline curve logic. So, that some curve points are overshot.
However, we can attain your requirement by rendering the SplineSeries with monotonic curve instead of natural curve.We have considered this requirement as feature enhancement and it will be available in any of our upcoming releases.