Fig. 5.

Different perspectives of the set containing the associated trigonometric coefficients of the face $F_0$ of the binary spin-1 correlations ${\mathcal{R}}_1$, and its extremal points from Lemma 14. The red and yellow lines correspond to the two consecutive extremal points for $F_{0,{\theta }_1}$ with ${\theta }_1\in \left(\pi ,/,2,,,3,\pi ,/,2\right)$, the pink dot corresponds to the case $F_{0,\pi /2}=F_{0,3\pi /2}$, and the green and cyan dots correspond to the two consecutive cases for $F_{0,\pi }$