Adam Sykulski, Lancaster University, Lancaster, United Kingdom, Jeffrey J Early, NorthWest Research Associates, Redmond, WA, United States, Jonathan M Lilly, Theiss Research, La Jolla, CA, United States, Sofia Olhede, Ecole polytechnique fédérale de Lausanne (EPFL), Switzerland and Arthur P. Guillaumin, University College London, London, United Kingdom