Thankyou Mathew. I had a look at the historical comparison chart. I can see what you mean, it does provide that functionality.
I guess the limitation (for me at least) is that I can’t use that functionality as a tool on the main workspace – I have to use it in a separate chart space, which isn’t as intuitive and doesn’t have some of the other features of a normal workspace and the broader context that provides.
The overlay tool is perfect for the job, but just lacks the ability to truncate it as I outlined. I appreciate that this is my idiosyncratic approach to the analysis and may not be a concern for others. I appreciate your consideration.
Cheers Chris