Fig. 8.
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Comparison of radio and optical light curves of PKS 2131–021. The sine waves shown in the figure come from Tables 1 and 4 of K25 for the radio and ZTF optical data, respectively. The fit to the ZTF data has been extrapolated back in time to show that the cadence of the CRTS is not sufficient to easily discover this sinusoidal pattern (see text for additional details).
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