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\label{fig:example_lcs}. Examples of quasar light curves generated by the CAR model, with different variability amplitude $\sigma$ and characteristic time-scale $\tau$. {\bf Greg, what are the values of $\sigma_0$ $\tau$ ($\sigma_0=0.01$ mag day$^{-1/2}$  and $\tau_0$ $\tau_0=300$day  in this example?}. example).