I got the distribution from the diagram by prolonging the initial $1+$ and $1-$ curves on $Y$, getting the numbers that appeared on the converging points and bolding the prime ones. Then I compared those that appeared on $Y+$ and $Y-$.
I found a similar diagram representing an example of Galois corresponde (Ref. "A Book of Abstract Algebra", Charles C. Pinter):
On the other hand, adding also to $Y+$ and $Y-$ the numbers that converge when prolonging the curves from the point $9$ on $Y$ (I didn't draw thos prolongations on the diagram), the resultant distribution is this another one:
It also can be presented in this way: