...envelopes

Based on data obtained at the European Southern Observatory, La Silla, Chile. Also based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute; STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France and of the NASA/IPAC extragalactic database (NED), which is operated by the Jet Propulsion Laboratory, Caltech under contract with the National Aeronautics and Space Administration.

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...IRAF

IRAF is the Image Analysis and Reduction Facitily made available to the astronomical community by the National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy (AURA), Inc., under contract with the U.S. National Science Foundation.

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...stsdas.analysis.isophote

STSDAS is distributed by the Space Telescope Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.

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