c# - How to replicate what Excel does to plot a Scatter with

I need to replicate an Excel "Scatter with Smooth Lines" graph in code. I'm trying to use a line with Highcharts, so I'm must get the data that Excel uses to build the smooth line. This is Excel

6 Scatter plot, trendline, and linear regression - BSCI 1510L Literature and Stats Guide - Research Guides at Vanderbilt University

c# - How to replicate what Excel does to plot a Scatter with smooth lines graph - Stack Overflow

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i.ytimg.com/vi/9wX1a1J4WOI/hq720.jpg?sqp=-oaymwEhC

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