I used the Vertical Table Header Cell Renderer that is available in this site here It works great for me but I need a clue on how can I have in some headers that are vertically aligned multiple rows like this you can see in the image of the example (Coordinate Geometry). I tried to set the strings with the appropriate \n character but I think my approach is very simplistic and wrong. Please keep it simple. Thank you!
In front put <html> to make it HTML text, and use <br> (line break) instead of \n.
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