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

Python Plotting scatter charts in excel sheet using XlsxWriter module - GeeksforGeeks

How to Implement the Best Fit Function, and Apply it to a Chart's Series

How to plot rectangles into a scatterplot with LibreOffice or Excel?

improve your graphs, charts and data visualizations — storytelling with data

How to Make a Scatter Plot in Excel to Present Your Data

Plot Data with Microsoft Charting

Create Excel 2016 Chart Types in C#

IMSL C# Chart Guide: Scatter Plot

C#/VB.NET: Create a Line Chart in Excel

How to Create a Scatter Plot in Excel

16 Excel Tricks You Need to Know

How to Create a Scatter Plot in Excel - dummies

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