Figure 5.

Relative concentrations of the three di-cation forms of d(G₃T₄G₄)₂ as a function of total concentration of K⁺ ions. Stars, circles and triangles represent experimental relative concentrations of $\text{di-}{}^{15}\text{NH}_4^{+}$ (1), mixed ${\text{K}}^{+}\text{-}{}^{15}\text{NH}_4^{+}$ (2) and di-K⁺ (3) forms, respectively. Dotted curves represent the best fits of the experimental data to Equations 1 and 2. The maximum individual discrepancy between experimental and calculated fractions of 1–3 was 5 unit%, whereas root-mean-square deviation was 2 unit%.