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Far-Ultraviolet Observations of NGC 4151 during the [ITAL]ORFEUS-SPAS II[/ITAL] Mission
We observed the Seyfert 1 galaxy NGC 4151 on 11 occasions at 1-2 day intervals using the Berkeley spectrometer during the ORFEUS-SPAS II mission in 1996 November. The mean spectrum covers 912-1220 Å at ~0.3 Å resolution with a total exposure of 15,658 s. The mean flux at 1000 Å …