... starburst

Table 2 and Fig. 9 are only available in electronic form at http://www.edpsciences.org

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... Database

The NASA/IPAC Extragalactic Database (NED) is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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... WFPC2

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.

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... IRAF

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

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... Clump A

Clumps are labeled following the notation of Duflot-Augarde & Alloin (1982).

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