Same as Fig. 3, but for HD 20794. The first two components, PC₁(t) and PC₂(t), display a qualitatively similar behaviour (and hence origin) as for HD 192310. However, we note that the sign of the offsets due to ThAr ageing on PC₁ (t) is now reversed and smaller with a jump of 10 cm s⁻¹. The three components PC₃(t), PC₄(t) and PC₅(t) all present 1-year power. For this star, the rms of each of the components fit to the RVs according to Eq. (5) (〈α_j〉 • PC_j(t)) is smaller than 10 cm s⁻¹.