Left panel: O−C residuals of the observed times of primary minimum of IO Aqr assuming the linear ephemeris from Table 6 and predicted O−C caused by the light-time effect from our third-body solution – continous line. Right panel: predicted radial velocity changes of the binary mass centre (continuous line denoted 1+2) and the third body (dashed line denoted 3). The horizontal line corresponds to the heliocentric frame systemic velocity of the whole triple system. The individual binary mass centre velocities from HARPS are marked by filled circles and CORALIE velocities by open circles. The velocities of the third body were binned into seasonal means.
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