Table 1. SAXS-Derived L-C₁₆-K Helix Parameters^a.

pH	R (nm)	ψ (deg)	W (nm)	h/P	% polydispersity
6	62.6	29.3	115.6	0.59	5.5
7	69.6	31.9	128.1	0.56	8.7
11	78.2	39.5	189.3	0.61	10.7

^aFor parameter definitions, see Figure 3D. The case h/P = 1 corresponds to nanotubes with helical markings, and h/P < 1 corresponds to open helices. Bilayer parameters were fixed as t_h = 0.75 nm, t_t = 2.3 nm, ρ_h = 430 e/nm³, and ρ_t = 307 e/nm³.