... Avoidance

Based on data obtained at Calar Alto (Spain) and Asiago (Italy) observatories.

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... IRAF

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

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... NED

NASA extragalactic database.

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... template

Galaxy template spectra by Kinney et al. (1996) are available from ftp://ftp.stsci.edu/cdbs/cdbs2/grid/kc96/

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...=121.7 kpc

Throughout this paper we assume $H_0~=~75~\rm km~s^{-1}$, unless otherwise specified.

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