  We follow the evolution of Copper and Oxygen two-hole excitations, in
optimally doped (Ca$_{x}$La$_{1-x}$)(Ba$_{1.75-x}$La$_{0.25+x}
$)Cu$_{3}$O$_{y}$ for $x=0.1$ and $x=0.4$. The spectra have contributions from
band states as well as a localized multiplet structure. From their
identification, we determine the intrashell Coulomb interaction $U$ for Oxygen
and Copper sites. These results allow us to estimate the atomic superexchange
coupling $J$ suggesting a positive correlation between the maximal
superconducting critical temperature $T_\text{C}^{max}$ and $J$.
