Table 1.

Fitting parameters and the corresponding theoretical value of R (see SI Appendix) compared with the measurements

[NaCl], mM	konstraight, (M·s)−1	lsleff, bp	$1/\sqrt{I_{\text{DNA}}}$, bp	Rtheory	Rmeasured
0	0.8 × 108	97	518	1.11	1.3
25	1.0 × 108	123	485	1.15	1.1
100	1.0 × 108	122	120	1.63	1.7
150	0.09 × 108	9.1	80	1.10	1.3

The measured on rates for extended DNA, k_on^straight, are used as input for the theory to obtain the values of l_sl^eff assuming that the estimate x_act = 0.75% holds for all [NaCl].