Fig. 4
Plot of the standard deviation (σ) from the weighted mean ( ⟨ m ⟩ ) of a series of observed NUV magnitudes (m) for the sample of quasars with ≥ 5 observational visits by GALEX. Superposed on this plot (full line) is the theoretical 3-σ variance from the measured mean NUV magnitude. Only points above this variance were selected as being statistically variable in the NUV.
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