Radial velocity measurements of HD 4113A taken with CORALIE (blue dots for data taken before the 2007 upgrade, and purple dots for data taken later) and with HIRES (orange dots), covering the time period from October 1999 to September 2017. Four CORAVEL measurements from as early as May 1989 are also included (black dots), extending the time baseline to 28 years. The top panel represents the observed CORALIE RV time series with the eccentric-orbit model of thegiant planet HD 4113A b as well as the long-term drift corresponding to HD 4113 C. The middle panel shows a phase-folded representation of the RV orbit of HD 4113A b, while the bottom panel shows the predicted and observed RVs for the orbit of HD 4113C after subtracting the signal produced by HD 4113A b. Several possible orbits drawn from the output of our MCMC procedure are shown. The bold red curve represents the maximum likelihood solution.