... nebulae[*]
Based on observations collected at the Centro Astronómico Hispano-Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC).
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...[*]
Figure 1 is only available in electronic form at http://www.edpsciences.org
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Copyright ESO 2005