\textbf{Acknowledgments}
This research was made possible by a grant from the ESRF.
We thank the following people for their support, without whose help this work would never have been possible: V. Honkimaki, A. Jublan, L. Ducotte, C. Carole, M. Brendike and M. Lessourd and the whole team of the Precision Mechatronic Laboratory.

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