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Each curve corresponds to a range of values of $\mathaccent "705E\relax {a}$ from $-0.9$ (left) to\nobreakspace {}$+0.9$ (right) for a single mode $\ell $ and $|m|$. The open circles are placed at the values $\mathaccent "705E\relax {a}=-0.9$, $-0.6$, $-0.3$, $0$, $+0.3$, $+0.6$, and\nobreakspace {}$+0.9$ except when $m=0$ in which case there are no negative values of\nobreakspace {}$\mathaccent "705E\relax {a}$ plotted. 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