Maximum likelihood periodograms for the remaining six stars. The same description as in Fig. A.1 applies. The FAPs of 5% (dashed), 1% (dash-dotted), and 0.1% (dotted) are plotted as gray horizontal lines. The identifiers of the two planet hosts, HIP 75458 and HIP 88048, are marked in red. For HIP 80488, we mark the second significant periodicity, corresponding to the outer brown-dwarf companion, as the violet, vertical line. We omit plotting its aliases and harmonics for visual clarity.