The equality epoch in the constant wwDM model. Posterior samples in the (w_DM, w_DE) plane are colored by 10⁴a_eq for CMB-1000 (left) and the CMB lensing-marginalized likelihood (right). The star marks ΛCDM. The correlated displacement in the two equations of state occupies a narrow equality range, equivalently a narrow early-Universe Ω_mh². Late-time geometry selects the w_DE displacement, and w_DM changes the conversion between the present and CMB-calibrated early dark-matter densities.