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Figure 1
Hartmann principle. The incoming beam (blue) is divided into an array of partial beams by the Hartmann plate. The centroid deviation [\Delta x] from the known reference spot position divided by the distance l yields the local wavefront gradient [\beta_x] relative to the reference wavefront (red).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 1| January 2016| Pages 43-49
doi:10.1107/S1600577515020354
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