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

Scatter Chart in Excel (Examples) How To Create Scatter Chart in Excel?

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How to Create a Scatterplot with Multiple Series in Excel - Statology

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

Complex graphs are possible in Excel using layers : r/excel

How to Combine Scatter Plots In Excel

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Excel Tips n Tricks -Tip 8 (Applying Chart Data Labels From a

how to make a scatter plot in Excel — storytelling with data