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QuasarSpectrum_wbg.gif
A mean QSO spectrum formed by averaging spectra of over 700 QSOs from the Large Bright Quasar Survey.1 Prominent emission lines are indicated. Data courtesy of P. J. Francis and C. B. Foltz.
 

References

1. Francis, P. J. et al. (1991): A high signal-to-noise ratio composite quasar spectrum. The Astrophysical Journal, 373: 465-470


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