Phased high-precision RV measurements for WASP-174. The instruments used are labelled in the plots. Top panel: phased measurements together with our best-fit model. Zero-phase corresponds to the time of mid-transit. The center-of-mass velocity has been subtracted. The solid line shows the best-fitting model (see discussion in Sect. 3). Second panel: velocity O-C residuals from the best fit. Third panel: bisector spans (BS). Note the differentvertical scales of the panels.