Figure 4.

Linear fits of log (½ k₊² K_n*c^(n*+2)) vs. log c for K₂Q₂₈K₂ (■), K₂Q₃₆K₂ (●), and K₂Q₄₇K₂ (▴). Reference lines with exact slopes of 3 (○) and 4 (□) are shown for comparison. The slope plotted is that from fits such as those shown in Fig. 3.