Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with proposal GO-07263.

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Table 4 is 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/415/331

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... code

ICUR (http://sbast3.ess.sunysb.edu/fwalter/ICUR/icur.html) is a general purpose screen-oriented data analysis program written in IDL for manipulating and analyzing one dimensional spectra. It is distributed to the public by the authors (F. M. Walter and J. E. Neff).

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... fits

For the fits of N V 1238 Å, Si IV 1393 Å, and C IV 1548 Å, a third Gaussian component was used to account for the absorption feature possibly originating in the intervening interstellar medium.

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