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The intraday optical variability of the BL Lacertae object S5 0716+714 is studied using historical light curves. The well‐sampled intranight data set is selected. In total, 19 333 data points have been collected over 208 nights. The source exhibits strong variability in the optical band. At a confidence level of 99.9 per cent, for 162 of the 208 nights the source shows intranight variability. The...
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