The Authors wish to express their thanks to Dr Dominik Bomans from Astronomisches Institut der Ruhr-Universität Bochum for providing us with his H map in a numerical format. We are grateful to numerous colleagues from the Max-Planck-Institut für Radioastronomie (MPIfR) in Bonn for their valuable discussions during this work. We want to express our profound gratitude to Dr Elly M. Berkhuijsen from MPIfR for her critical reading of the manuscript and precious suggestions concerning its improvement. M.U. and K.Ch. are indebted to Professor R. Wielebinski (MPIfR) for the invitations to stay at this institute where substantial parts of this work were done. One of us (K.Ch.) is indebted to Professor Miller Goss from NRAO for his invitation to Soccorro and his assistance in some parts of data reduction. We are also grateful to colleagues from the Astronomical Observatory of the Jagiellonian University in Kraków for their comments. This work was supported by a grant from the Polish Research Committee (KBN), grant no. 962/P03/97/12. Large parts of computations were made using the HP715 workstation at the Astronomical Observatory in Kraków, partly sponsored by the ESO C&EE grant A-01-116 and on the Convex-SPP machine at the Academic Computer Centre "Cyfronet" in Kraków (grant no. KBN/C3840/UJ/011/1996 and KBN/SPP/UJ/011/1996).
© European Southern Observatory (ESO) 2000
Online publication: March 17, 2000