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We analyse continuum and emission-line variability in NGC 4151 based on IUE spectra taken with nearly complete 1-d sampling over a 35-d interval during 1991 November–December. The 1320-Å continuum undertook a bumpy exponential decline by a factor ∼3 over 25 d, and then made a dramatic recovery in ∼2 d near the end of the campaign. The same pattern of variations occurred in all continuum bands with...

A month in the life of NGC 4151: velocity-delay maps of the broad-line region