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The data of the quasar 3C 273 in optical band have been accumulated for nearly 100 years. Based on the obtained light curve, we analyzed the periodicity of its light variation using the Period04 software. It is found that there are three periods in the light curve, including 2.06 yr, 13.03 yr, and 21.15 yr. These are basically consistent with the conclusion of Fan et al., that the periods of 3C 273...
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