What do you mean by flat surfaces?
I would appreciate if you can explain about flat surfaces.

What I want to achieve here is that a part of one series above any part of another series must be displayed by itself meaning that any bottom part of another series must be completely hidden from the view.

1. No, these shapes are not the shapes that we want.
The series that appears to be on the top of another series should not be kind of transparent. It must entirely cover the bottom series.

2. Yes. This overlap issue happens in Steema Net.

With userID as PIDOTECH and email as kjh0213@pidotech.com, I have sent a zip file called WindowsFormsApplication1.zip to your server.

I look forward to finding a solution for this issue.

Thank you.

I would like to attach a project file to show what I meant, but I was not able to do so because of the size limitation up to 502 kb.
It would be greatly appreciated if I would be provided an e-mail address, so I can send my project file to you.

Thank you.

As I was making a surface chart, I encountered an issue with it.
I attached a file that describes the situation that I am facing.
I would like to know how I would be able to fix this issue.

Thank you for your cooperation.