Crystal field: splitting, spin and CFSE

Six ligands on the axes lift the degeneracy of the five $d$ orbitals. The $d_{z^2}$ and $d_{x^2-y^2}$ orbitals point at the ligands: the $e_g$ level, at $+0.6\,\Delta_{\text{o}}$. The $d_{xy}$, $d_{xz}$, $d_{yz}$ orbitals point between the ligands: the $t_{2g}$ level, at $-0.4\,\Delta_{\text{o}}$. The barycentre is preserved: $3 \times (-0.4) + 2 \times (+0.6) = 0$.