Fig. 5.
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W([O III]λ5007) versus c(9/10). Blue and red squares indicate high-redshift Pop. A and Pop. B quasars from M09 while grey and orange open squares represent low-z sources from Marziani et al. (2003), respectively. Colour scheme for our sample as the same as in Fig. 4. Error bars refer to 1σ level of confidence and were estimated only for our sample.
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