Evolution of the component separation from the core and the flux density for the innermost components of CTA 102. Top: separation from the core and fitted trajectories for C1, C2, C3, and C4. The gray shaded ares correspond to the ejection epochs for C1 and C2 and the dashed line to the crossing of a possible stationary feature at r ~ 0.1,mas away from the core (dashed horizontal line). Bottom: flux density evolution of the components including the core and single-dish flux density measurements at 37   GHz and 230   GHz. For details see text.