How to modify the width and line style of some (but not all) lines in an embedded chart?

[lovecolorado]

I'm a chart novice and certain that someone will explain the proper procedure before.

Can anyone tell me how to modify an embedded chart to thicken the line and change the line style to dash?

I tried to do this with the following line of code, but the macro hung and the following line of code was marked as the reason why the macro hung:

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The exact error code is
Untitled.png

[AliGW]

Administrative Note:

Unfortunately, this is a duplicate thread, and you are allowed only ONE thread per issue here. I am, therefore, closing this thread, but you may continue here in the original thread: https://www.excelforum.com/excel-pro...n-a-graph.html