Based on observations obtained at the German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institut für Astronomie Heidelberg jointly with the Spanish National Commission for Astronomy.

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In this paper the term QSO is used as a broad term that combines all types of quasars in one category. When the radio flux is specifically used to distinguish between radio-loud and quiet QSOs, the term RLQ or RQQ will be used.

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