5. Conclusions

Preliminary conclusions from this study are the following:

1. We have confirmed that 4 clusters (A3554, A3566, AS718, AS731) are members of the supercluster. We have also found that one cluster, A3524, originally reported to be a member of the S.C., is really background.
2. We have shown that 4 clusters are formed by a superposition of several layers or sheets of galaxies, one of them located at the general S.C. redshift range. A3577 has a second component at , together with A3571, A3575 and A3578. The clusters A3542, A3557, and AS733 have a second background component.
3. We have shown that, at least, 4 clusters (A3571, A3575, a component of A3577 and A3578) located in the R.A. and dec zones are part of a structure located in front or extending towards the front of the S.C. A more precise definition of a possible connection with the S.C. has to await more data.
4. The cluster A3581 is a foreground system. Further to A3524, A3545 and A3549 are also background clusters.
5. Walls at and seem to be present behind wide zones of the S.C.

Acknowledgements

We are grateful to ESO for this unique opportunity to use the MEFOS facility. This research was partially supported by the cooperative program ECOS/CONICYT U9302. D.P particularly thanks the finantial support provided by ECOS and CONICYT during his stay at the P. Universidad Católica de Chile. H.Q gratefully acknowledges partial support from FONDECYT Grant and the award of a 1995 Presidential Chair in Science. We also thank our referee, Dr. A. Fairall.