Ratio $C_2^{+-}(\kt_6) / C_2^{+-}(\kt_1)$, comparing mixed-charge correlations between the highest (sixth) and lowest (first) $\kt$ bins. Open circles represent the Therminator comparison using all pion pairs (diluted). Open squares represent the Therminator calculation only using pion pairs with $r^*< 80$ fm (undiluted). Error bars include statistical and systematic uncertainties.