Fig. 1

Top: timespan of observations over binaries of different periods. The flat distribution means that our sensitivity to tertiary objects is roughly independent of the binary period. Middle: number of orbits covered for each binary. There is no strict minimum although 86% of binaries have been observed over a timespan covering at least 100 orbits. Bottom: number of observations given to each binary. There is a requirement of at least 13 observations.
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