Fig. 1

Example of galaxy spectral energy distribution with two different metallicities from Schaerer & Pelló (2002), and with the FORS2 and HAWK-I bands superimposed (magnitudes are arbitrary normalized). To illustrate the band selection, the spectra have been redshifted to 5.1, as for GRB 050622 (top), and 6.7, as for GRB 080913 (bottom).
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