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Fig. 17


As Fig. 15, but the ionization fraction of He iii is now shown (cf. Table 3). The efficiency to ionize He ii rises for higher fractions of hydrogen and lower metallicities in the stars. This leads to Strömgren radii around VMSs which are a factor of up to 100 larger than those around “normal” 125 M stars (cf. Fig. 13).

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