... NGC 588

Tables 1, 2, 4, Figs. 1, 2, 9, 10 12, 13 and Appendix A are only available in electronic form at http://www.edpsciences.org

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... IRAF

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

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...(INES

The INES System has been developed by the ESA IUE Project at VILSPA. Data and access software are distributed and maintained by INTA through the INES Principal Center at LAEFF. http://ines.laeff.esa.es/.

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... lines

A value of the electron temperature of 11 000 K (Vílchez et al. 1988) was assumed for the theoretical Balmer ratio.

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... function

This has been shown to be the best analytical representation of atmospheric turbulence (e.g., Terebizh 1991).

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