Click on the above spectrum to see it in its full glory. Note the spectrum shown is from old HUT data (pre-2013 version), but is still representative.
This ultraviolet spectrum of the active galaxy NGC 4151
obtained by HUT during the Astro-1 flight shows the intensity
of light recorded by HUT's detector at each wavelength. Emission features
and absorption features due to various ionization states of different elements
in the hot gas present in the nucleus of this active galaxy are marked.