Rather complicated 2D histogram in ROOT

Dear ROOTers, I was asked to reproduce a histogram looking like the attached figure. I am usually quite ok with ROOT, but I really don’t know how to proceed to plot this with the TH2 class. Any idea or example would be appreciated.
The z-axis part is trivial, but what blocks me is the lateral axis, as you can see values are repeated, I am not sure I can customize the TAxis this way.

So far I am thinking of creating a unique (X,Y) intermediate bin for each entry, so they show up as sorted in the histogram , then delete the axis, and slam text on top of each bin. That seems feasible, but I am sure there is a more efficient way.

Any help is appreciated !

Cheers ,


Go here and scroll a bit down. There is exactly the same plot.

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