Based on observations performed with the
6 m telescope of the
Special Astrophysical Observatory, Russia, the 2.2 m ESO/MPG
telescope at La Silla,
and with the NASA/ESA Hubble Space Telescope, obtained from the
data archive at the
Space Telescope Institute. STScI is operated by the association of
Universities for
Research in Astronomy, Inc. under the NASA contract NAS 5-26555.
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