Statefinder diagnosis for the extended holographic Ricci dark energy
  model without and with interaction
  We apply the statefinder diagnostic to the extended holographic Ricci dark
energy (ERDE) model without and with interaction to study their behaviors. We
plot the trajectories of various parameters for different cases. It is shown
that the non-interacting model does not reach the LCDM point $\{1,0\}$ and the
interacting one is favored, because the interaction makes the evolution of the
statefinder pair $\{r,s\}$ quite different.
