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Derived key requirements:<br />

• lifetime of the telescope > 20 years<br />

‣ reproducibility of the wavelength calibration over that<br />

time<br />

• Ultra-high resolution (i.e. stable) spectrograph<br />

‣ Coudé focus for the spectrograph<br />

Markus Kissler-Patig - ELT <strong>Science</strong> <strong>Case</strong>

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