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EMBL O u t s t a t i o n Hamburg, C/o DESY, N o t k e s t r a s s e 85, 0-2000 Hamburg, F.R.G. " a n d Department of P h y s i c s , U n i v e r s i t y o f Warwick, GB-Coventry CV4 7AL, G r e a t -B r i t a i ndoi:10.1051/jphyscol:19868102 fatcat:mhf6pwnz3bhorkqdt5lvqijlei