SDSS J120414.37+351800.5 quasar optical photometry
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https://b2find.eudat.eu/dataset/d1534bb8-946c-5602-924a-b0c59eb7ed1f
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A small fraction of quasars show an unusually high nitrogen-to-carbon ratio (N/C) in their spectra. These "nitrogen-rich" (N-rich) quasars are a long-standing puzzle because...
