Pseudogap is almost 190 K for YBa₂Cu₃O_7−x (T_c ≈ 86.5 K) based on derivative $\frac{\partial g}{\partial T}$.

Temperature dependent g factors are investigated in a phenomenological and numerical way.

g factors are linearly dependent of the implicit temperature normalized parameter γ.

The local structures of Cu²⁺(1) are reasonably explained in view of pseudo Jahn-Teller effect.