Fig. A.4.
Ionizing part of the spectral energy distribution for co-eval stellar populations with metallicities Z = 0.006, 0.002, and 0.0002 from top to bottom. The spectra are normalized at the ionization threshold for hydrogen, 13.6 eV. The models from STARBURST99 have here Z = 0.008, 0.002, and 0.001 (see Table A.1). See also Fig. 7.
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