... galaxies

Appendices A and B are only available in electronic form at http://www.edpsciences.org

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... galaxies

The Palomar survey presented in Ho et al. (1995) includes high-quality spectra of 486 bright ( $B_T \la12.5$ mag), northern ( $\delta >0^{\circ}$) galaxies for which a comprehensive, homogeneous catalog of spectral classifications have been obtained (HFS97a). The Palomar survey is complete to B_T = 12.0 mag and 80% complete to B_T = 12.5 mag (Sandage et al. 1979).

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... criterion

Its original distance measurement (D = 16.8 Mpc; Tully 1988) has been updated recently to D = 31.7 Mpc (Caldwell et al. 2003).

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... cross-normalizations

See http://xmm.vilspa.esa.es/external/xmm_sw_cal/calib/index.shtml

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