The observed correlation structure suggests that local charge conservation at hadronization combined with increasing system density and spatial extent results in evolution with Au-Au centrality from one-dimensional (1D) [*charge-ordering*]{} (locally alternating charge signs) on configuration space $z$ (the collision axis), coupled to $p_z$ (or pseudorapidity $\eta$) by longitudinal Bjorken expansion, to two-dimensional (2D) charge ordering on beam and azimuth directions $(z,\phi)$. Those results have not been anticipated by theoretical models [@jetquench; @rqmd].

Analysis Method
===============

We wish to access the complete [*charge-dependent*]{} (CD) structure of two-particle density $\rho(\vec{p_1},\vec{p_2})$ with minimal distortion and without imposition of a correlation model. In this analysis of net-charge [*angular*]{} correlations we project the two-particle momentum space onto angular subspace $(\eta_1,\eta_2,\phi_1,\phi_2)$ by integrating over a specific transverse momentum interval. The structure of net-charge correlations on [transverse momentum]{} with specific angular constraints will be considered in a future analysis.

Correlations are obtained with a [*differential*]{} analysis which compares object and reference pair density distributions. The object distribution is comprised of particle pairs formed from single events, referred to as [*sibling*]{} pairs, and the reference distribution consists of pairs combining particles from two different but similar events, referred to as [*mixed*]{} pairs. The corresponding pair densities are denoted 