Based on observations made with the William Herschel Telescope (WHT), operated by the ING, and with the Italian Telescopio Nazionale Galileo (TNG), operated on the island of La Palma by the Fundación Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica), both at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

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Note that in some publications (Munn et al. 1997, BTK) the same objects are designed by a serial number equal to (NSER+100 000).

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