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Fig. 11

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Alignment of the UVB arm 0.5′′ pinhole with respect to the focal plane reference pinhole with (red) and without the flexure compensation (black) through a full rotation of X-shooter at a zenith distance of 60°. The AFC allows to maintain the alignment to  ~ 0.01′′, well within specification of 1/10th of the narrowest slit width.

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