Nature Communications 7: Article numbber:1069910.1038/ncomms10699 (2015); Published: March 07 2016; Updated: July 19 2016.
Technical support for this Article was not fully acknowledged. The Acknowledgements should have included the following: We are also grateful to Dr Alexei Barinov for his kind help during our beamtime at the spectramicroscopy beamline of the Elettra synchrotron.
