What do the conditions of exact pseudospin symmetry in nuclear relativistic models mean in real nuclei

We study the continuous evolution of the single-particle levels from a model satisfying exact spin symmetry (SS) to another one satisfying exact pseudospin symmetry (PSS), using a Dirac equation with potentials of scalar, vector and tensor type. All the standard pseudospin doublets (PSDs) appearing in the limit of the SS have their corre- sponding PSDs in the limit of the PSS but not vice versa. The PSS is strongly violated between the SS and PSS limits.