Joint fits to the baryon-to-photon number ratio, η10=1010η, and the equivalent number of light neutrino species Neff, using a χ2 analysis with the code developed by Fiorentini et al. (1998) and Lisi et al. (1999). The value of the primordial 4He abundance has been set to Yp = 0.254 (Fig. 13) and that of (D/H)p is taken from Pettini & Cooke (2012). The neutron lifetime of τn = 880.1 ± 1.1s from Beringer et al. (2012) has been adopted. The filled circle corresponds to . Solid lines from the inside out correspond to confidence levels of 68.3% (), 95.4% () and 99.0% (), respectively. The SBBN value Neff = 3.046 is shown with a dashed line.
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