... confined

In Paper I we discussed situations in interferometry where this is not the case. These are unlikely to occur in VLBI.

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... ways

There are combinations $\vec{F}_{j \vphantom{'}}$ and $\vec{F}_{k \vphantom{'}}^{\dagger}$ whose product equals $\vec{Y}_{\mathbf{q}}(\xi)$, producing another type of solution for a single interferometer. Such solutions are not possible, however, for a triangle of interferometers as required for self-alignment.

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