... Cluster

Based on observations taken with the ESO/NTT (ESO program 64.N-0288), with the Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Centro Galileo Galilei of the CNAA at the Spanish Observatorio del Roque de los Muchachos of the IAC, with the San Pedro Martir 2.1 m telescope of the Observatorio Astronomico Nacional (OAN, Mexico), and with the OHP 1.2 m telescope, operated by the French CNRS.

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... mosaic

Sketches of typical "mosaics'' can be found in Fig. 2 of B97.

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... NED

NASA-IPAC Extragalactic Databasa (NED) is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA.

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... 2MASX

2MASX1J1211211+141438,

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... CEG050

[BCS89] 050.

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... package

IRAF is the Image Analysis and Reduction Facility made available to the astronomical community by the National Optical Astronomy Observatories, which are operated by AURA, Inc., under contract with the U.S. National Science Foundation. STSDAS is distributed by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS 5-26555.

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