Primordial abundances as a function of baryon-to-photon ratio. Green dashed and blue solid lines indicate the SBBN and our solution, respectively. Red boxes are observational data of each abundance, and the shaded yellow area shows the CMB constraint on the baryon-to-photon ratio: η = (6.094 ± 0.063)×10⁻¹⁰. In our model, lithium solutions are found at 6.031 <  η × 10¹⁰ <  6.070.