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Figure 3
Two ex situ slope error scans of the I02 VFM taken two years apart. The vertical dotted lines indicate the junctions of the piezoelectric plates. Note that the only observed change in the surface features is the appearance of a spike at the far right-hand edge of the mirror (about 0.55 m). Visual inspection showed that the spike coincided with a burn mark.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 19| Part 6| November 2012| Pages 960-968
https://doi.org/10.1107/S090904951203662X
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