... spectroscopy

Based on observations made with ESO Telescopes at the Cerro Paranal Observatory under programme ID 72.B-0144 and the La Silla Observatory under programme ID 073.B-0013

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...

Appendix is only available in electronic form at http://www.edpsciences.org

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...

Tables with emission-line fluxes are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/456/953

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... FORS1

FOcal Reducer/low dispersion spectrograph.

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... EMMI

ESO Multi-Mode Instrument.

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... REMD

REd Medium Dispersion spectroscopy.

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... BLMD

BLue Medium Dispersion spectroscopy.

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...MIDAS

Munich Image Data Analysis System, trade mark of ESO.

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...$T_{\rm e, obs}$

Derived from the [O III]($\lambda$4959 Å+$\lambda$5007 Å)/$\lambda$4363 Å emission-line ratio.

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... temperature

$n_{\rm e} ({\rm T}) = n_{\rm e} ({\rm [SII]~ratio}) \cdot \sqrt{(T/10~000)}$.

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