The Nilsson orbitals used in the substitutions occurring in the proxy-SU(3) scheme, which are the orbitals bearing the maximum value of total angular momentum in each shell, have an extremely simple structure in the shell model basis |NljΩ⟩\documentclass[12pt]{minimal}
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\begin{document}$$|N l j \Omega \rangle $$\end{document}, with each Nilsson orbital corresponding to a single-shell model eigenvector. This simple structure is valid at all deformations for these orbitals, while in other orbitals it is valid only at small deformations. Nilsson 0[110] pairs are found to correspond to |1110⟩\documentclass[12pt]{minimal}
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\begin{document}$$|1 1 1 0\rangle $$\end{document} pairs in the spherical shell model basis, paving the way for using the proxy-SU(3) approximation within the shell model.