Fig. 10.
Uncertainty reached as a function of the exposure time for the field measured obtained with the FORS2 instrument (black solid circles), and with the ISIS instrument in the red and in the blue arm (blue filled circles and red empty circles, respectively). Exposure time is normalised to the time needed to obtained S/N = 1000 per Å. The meaning of the symbols is the same as in Figs. 8 and 9.
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