[*by a factor 10*]{}. The dramatic shape and amplitude changes strongly contradict a p-p linear superposition hypothesis [@nbar] for all but the most peripheral Au-Au collisions.

These results for net-charge angular correlations suggest that CD correlations in Au-Au collisions, as in p-p collisions, derive from configuration-space charge ordering as a consequence of local charge conservation during hadronization, but the hadronization geometry changes from 1D ($\eta$) in p-p collisions to [*at least*]{} 2D ($\eta,\phi$) in central Au-Au collisions, leading to an approach to angular symmetry on $(\eta_\Delta,\phi_\Delta)$. Transverse charge ordering (on $p_t$) is also possible but is studied in a separate analysis. Hadronic rescattering in A-A collisions could reduce the CD correlation amplitude at large $\phi_\Delta$ but would also reduce the width on $\eta_\Delta$ and therefore cannot be solely responsible for the nearly symmetric peak shape in central Au-Au collisions. In Fig. \[Figure4\] the contribution from 1D charge ordering (gaussian peak on $\eta_\Delta$) is already substantially reduced for centrality (d) ($\nu \sim 2.5$) in favor of the symmetric component (exponential peak).

A hadron-opaque medium in more central collisions may contribute to the newly-observed [*exponential*]{} peak shape. An exponential distribution on pair opening angle \[radius on $(\eta,\phi)$\] is consistent with: 1) correlations 