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Figure 7
(a) Calculated wavefront slope error using the differential-mode XSS technique. Slope errors along the dashed orange line (centre) and red line (upper edge) were extracted for comparion with the Diamond-NOM metrology results. An area of ∼1 mm width (half the image) from the 2D map of the wavefront slope error was extracted to match the size of the probe used for the ex situ measurement. The calculated slope errors within this area were averaged along the mirror width. (b) Slope errors projected back to the mirror plane. The Diamond-NOM result is shown as a dashed black line. The red and orange lines correspond to the upper edge and the centre of the measured area, respectively. The blue line is the averaged slope error corresponding to a 1 mm mirror width.

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