Thanks for your posting and using Aspose.Cells.
We were able to observe this issue. The blue color series line width has been set to 0.75pt but it does not look like this. Please download and try the latest version: Aspose.Cells
for .NET v220.127.116.11 and see if it resolves your issue.
If your issue still persists, then please provide us your runnable sample code replicating this issue. We will look into it and help you asap.
Thanks for your sample code and using Aspose.Cells.
We were able to observe this issue after executing your sample code with the latest version.
We have logged this issue in our database for investigation. We will look into it and fix this issue. Once, the issue is resolved or we have some other update for you, we will let you know asap.
This issue has been logged as
- CELLSNET-43189 - Line width is not getting applied to the chart
I have also attached the output Excel file generated with your code for a reference.
Thanks for your using Aspose.Cells.
Please download and try the latest fix: Aspose.Cells for .NET v18.104.22.168 and let us know your feedback.