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That's tricky question.
You need to decide how to handle these nulls (bottom table)
I put two solution to align the values to bottom of "UPMC".
This picks max value of each month.
This pix bottom of the pane. (UPMC in this format)
Based on the filter, it may be impossible to specify the non-null value every time, then you should eliminate all nulls at raw data level.
Thank you so much ZZ! This is exactly what I was looking for. I especially appreciate the .png.
No worries, glad to help.
And thank you for marking Shin's answer as helpful as well, because I think both of us share the brain at that moment