... 2744

Table 1 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/449/461

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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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... Col. 7

In reporting data of Couch et al. (1998) from their Table 3 we corrected a few typos (Couch, private communication): the declination of CN97, CN130, CN340. Moreover galaxy CN244 of Couch et al (1998) corresponds to CN258 of Couch & Sharples (1987).

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...$\beta _{\rm spec}=1$

$\beta_{\rm spec}=\sigma_{\rm V}^2/(kT/\mu m_{\rm p})$ with $\mu=0.58$ the mean molecular weight and $m_{\rm p}$ the proton mass.

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