The data reduction and analysis was partly carried out at the St. Andrews STARLINK node. Use of software developed by T. Marsh is acknowledged. ETH was supported by the TMR contract RT ERBFMBICT960971 of the European Union. ETH was partially supported by a joint research programme between the University of Athens, the British Council at Athens and the University of St. Andrews.
© European Southern Observatory (ESO) 1999
Online publication: June 17, 1999