Fig. 2
Contour plot of the reduced χ2 normalized to unity for the best fit using a generalized Lomb-Scargle periodogram for a two-companion fit to the eclipse-time variations of HW Vir. The solid lines indicate 2:1, 3:1 and 4:1 resonant orbits, the cross the best fit. Solutions with an inner planet of about 12.7 year orbital period provide good fits for a wide range of orbital periods of the outer companion.
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