TH3F "4D" histogram

[quote=“mfurlan”]That could totally work! It would be better if I could choose a more “gradient-like” palette, but it definetively is what I was looking for.
Do you think I may find the source code for that figure, in order to learn what commands I can use?[/quote]

I think, the source code can be found in this long thread:

Code must be obsolete, but still can be used.