1. Aurore Delaigle is Lecturer, Department of Mathematics, University of Bristol, Bristol, BS81 TW, U.K. and Belz Research Fellow, Department of Mathematics and Statistics, University of Melbourne, Melbourne, VIC 3010, Australia . Peter Hall is Professor, Department of Mathematics and Statistics, University of Melbourne, Melbourne, Australia and Professor, Department of Statistics, University of California, Davis, CA 95616 . The work was supported by a Maurice Belz Fellowship and by grants from the...