1. Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Universite Paris-Saclay, 91127 Palaiseau Cedex, France
2. Center for X-ray Optics, Lawrence Berkeley National Laboratory, 2-400 Berkeley, California 94720, USA
3. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
4. Institut des NanoSciences de Paris, 4 place Jussieu, F-75252 Paris Cedex 05, France