1. National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom
2. XMaS, The UK-CRG, ESRF-The European Synchrotron, CS40220, F-38043, Grenoble Cedex 09, France
3. Department of Physics, University of Liverpool, Liverpool L69 3BX, United Kingdom
4. Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, United Kingdom
5. Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
6. ESRF-The European Synchrotron, CS40220, F-38043, Grenoble Cedex 09, France
7. SIOS Meßtechnik GmbH, Am Vogelherd 46, 98693 Ilmenau, Germany
8. Electrosciences Ltd., Farnham, Surrey GU9 9QT, United Kingdom