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Astron. Astrophys. 317, 43-53 (1997)
Acknowledgements
We thank the team from CERGA, especially D.Albanese and C.Pollas for providing the northern Schmidt plates; the MAMA team, especially R. Chesnel and O. Moreau for their high-quality scans; P.Fouqué for enlightning discussions about the local universe and galaxy photometric systems; J. Loveday and G. Dalton for providing the APM comparison subsamples; J. Felten and our referee for useful suggestions.
© European Southern Observatory (ESO) 1997