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Note (5)  : Optical classification, defined as follows:
Q = quasar;
B = BL Lac object;
G = AGN other than B and Q (e.g. Seyfert galaxy);
E = empty field or unidentified optical counterpart; from Veron-Cetty Veron (2001, Cat. VII/224) unless appended by an asterisk, whereby the reference is given in the individual source notes.
  
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