Department of Statistics, University of Warwick, Coventry, UK. M.Komorowski@warwick.ac.uk|Department of Statistics, University of Warwick, Coventry, UK. M.Komorowski@warwick.ac.uk|Department of Statistics, University of Warwick, Coventry, UK. M.Komorowski@warwick.ac.uk|Department of Statistics, University of Warwick, Coventry, UK. M.Komorowski@warwick.ac.uk