Hi Matthew,
The scatter plot does not work like that. It applies the same scripts to all securities which you open.
I think what you are looking for is a Regression Chart, but you will have to use a script for the two codes to get it into terms of excess returns. That is not a simple thing to do and is a little beyond the type of support we can offer here. If it is something you really need, you can do a consultation with us and we’ll set something up optuma.com/consults.
All the best
Mathew