Evidence for quasar fast outflows being accelerated at the scale of tens of parsecs.

Correspondingly, t r is 10 0.56 ± 0.19 , 10 1.00 ± 0.21 , and 10 2.35 ± 0.41 days for low-, medium-, and high-velocity outflows, respectively, showing a clear trend of t r increasing with the outflow velocity ( Fig. 1B ).

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