# Big Bang Nucleosynthesis constraint on the physical baryon density,
# omega_b = Omega_b h^2, from the primordial deuterium and helium
# abundances -- completely independent of the CMB.
# Schoeneberg (2024), JCAP 06 (2024) 006, arXiv:2401.15054: the
# conservative PDG-abundance value, marginalized over nuclear
# reaction rates, and the prior DESI DR1/DR2 adopt.
#
# [value] [sigma]   omega_b h^2
0.02218 0.00055
