2s confidence intervals for the BBN predictions for ⁴He (Y_P), D/H (Y₂) and ⁷Li/H (Y₇) as functions of the baryon-to-photon ratio h, estimated by Monte Carlo method. Horizontal lines indicates 95% CL abundances from observations: dash lines demonstrate "lower D" experimental set of results, dot - "upper D" one. The vertical bands (we infer from the deuterium and lithium data) show the allowed h-ranges satisfying both theory and observations.