Table 1.

Chromatin compaction assessment by sedimentation coefficients of 12-nucleosome fibers with NRLs = 173, 191, and 209 bp and with 20, 50, 100, 150, and 200 mM NaCl

NRL (bp)	Monovalent salt (mM)	Computed $S_{20,w}$ (S)
173	20	35.4 $\pm$ 0.4
	50	41.5 $\pm$ 0.8
	100	47.5 $\pm$ 0.9
	150	49.8 $\pm$ 1.7
	200	51.9 $\pm$ 2.0
191	20	32.7 $\pm$ 0.5
	50	37.0 $\pm$ 1.1
	100	40.0 $\pm$ 1.4
	150	41.0 $\pm$ 1.1
	200	42.0 $\pm$ 1.3
209	20	32.1 $\pm$ 0.4
	50	34.9 $\pm$ 0.4
	100	36.0 $\pm$ 0.5
	150	36.5 $\pm$ 0.7
	200	36.5 $\pm$ 0.6

See Fig. 5 for plots with NRL = 209 bp.