The photometric elements found from the light curves are influenced by the
fact that the mass ratios of the components were not yet determined spectro-
scopically.
Acknowledgements. This study was supported by VEGA grant No. 2/1157 of the
Slovak Academy of Sciences. D.C. appreciates the invitation to Leiden Observatory,
where this work was initiated. We wish to thank Prof. R. E. Wilson for giving his
version of W&D code to our disposal