Fig. 6

In the column on the left, the larger marker sizes correspond to the larger values of \(n\in \{1000, 10{,}000, 20{,}000\}\) for fixed \(k=3\). In the column on the right, the larger marker sizes correspond to the larger values of \(k\in \{3, 4, 5\}\) for fixed \(n=10{,}000\)