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European Southern Observatory
New Technology Telescope
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General :
Observations :
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Grism Setup

Grisms are mounted on a wheel offering 9 positions, one being always free.
Positions 1 to 5 are used for low dispersion spectroscopy (RILD).
Positions 6 and 7 are used for cross-dispersion in Echelle mode.
Focus wedge is mounted permanently in position 8 and should never be removed.
To install a grism :

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