Based on observations collected at the European Southern Observatory, Chile, programme identification numbers 63.N-0528, 65.N-0577, 66.B-0419, 67.B-0504 and 68.B-0530.

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IRAF is distributed by the National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.

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... dispersions

This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.

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