Fig. 6.
Comparison of the interferograms of original and new M2. The display range is ±80 nm for both, showing wavefront errors, which are a factor of 2 larger than the surface errors. Some dust and fingerprints explain the small imperfections on the interferogram of the new M2. The WFE rms is 39 nm and 8 nm for the original and new M2, respectively.
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