Resulting MCMC simulations trajectory for a 3-Keplerian fit model (co-orbital configuration) obtained with the YARARA V2 RV time series of Table 3. The stellar mass of HD 20794 is taken as M_* = 0.81 M_⊙. If confirmed, the third signal at 644 days would orbit, during part of its orbit, in the habitable zone of the star (Kopparapu et al. 2013) between the innermost (dotted-dashed circle) and outermost limit (dotted circle). The orbital solutions from the median values of the posterior distributions of the Keplerian parameters are also displayed (main solid lines).