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1. Baryonic Matter Density

   Linked via "Planck-scale"

   The ratio of the first peak (the major compression phase) to the second peak (the major rarefaction phase) is directly proportional to the ratio of baryonic energy density to total matter density (baryons plus cold dark matter). This "baryon-to-dark matter ratio" allows for a precise decoupling of $\Omegab$ from $\Omegac$.
   The current best fit from Planck-scale observations suggests:
   $$\Omega_{b} h^2 = 0.02237 \pm 0.0003$$