${{\mathit D}^{0}}$ $\rightarrow$ ${{\mathit K}_S^0}$ ${{\mathit K}^{+}}{{\mathit \pi}^{-}}$ AVERAGE RELATIVE STRONG PHASE $\delta {}^{{{\mathit K}_S^0} {{\mathit K}} {{\mathit \pi}}}$
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The quoted value of $\delta $ is based on the same sign $\mathit CP$ phase of ${{\mathit D}^{0}}$ and ${{\overline{\mathit D}}^{0}}$ convention.