Fig. 1
Survey efficiency (telescope area × maximum number of allocated targets) and sky mapping efficiency (telescope area × instrument field of view, or étendue) of all operational (black) and planned/proposed (grey) multiobject optical spectrographs with FOVs larger than 100 arcmin2. All figures are normalised to those of the SDSS. Notice the extraordinary survey efficiency of VIMOS, only comparable to that of next generation instruments.
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