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Two 100 m fibers are 2mm=28arcsec separated to easily accept the
ordinary and extraordinary beams emerging from the polarisation analyser, see
next section. A part for the polarimetric mode, the second fiber is available to
record the sky spectrum simultaneously to the star spectrum.
Resolution with 100 m fibers is 28000. Higher values are obtaind using a
set of slits. Presently we forsee four motorised slits giving the resolution:
45000 (62 m) and 63000 (44 m).