Marginalized constraints for the constant dark-sector models. The left triangle uses CMB-1000 and the right triangle uses the CMB lensing-marginalized likelihood, always combined with DESI DR2 and DES supernovae. The diagonal panels show one-dimensional marginalized posteriors, while the lower-left panels show the joint w_DM–w_DE constraints. Contours enclose 68% and 95% probability, and dashed lines mark the ΛCDM values. Releasing only w_DM or only w_DE produces no significant departure, whereas releasing both selects the correlated quadrant w_DM > 0, w_DE > −1.