User blog comment:PsiCubed2/Fractional Psi Levels (extended table, summarized)/@comment-37246647-20181129060318/@comment-30754445-20181129154743

Oh, and if you're wondering about what topic to study next:

I recommend the basics of ordinals and the fast growing hierarchy. It is much simpler than you think, especially if you limit yourself - at first - to relatively small ordinals.

Start with the hierarchy up to ω2. That's already as strong as 4-entry arrays, so as a bonus you will also get an actual understanding of just how big {4,4,4,4} is :-)