Fig. 3. Mean (±S.E.M.) diameter of single
fibers from the sheet and supporting structure regions (SH/SSt;
N=54), gumfooted lines (GF; N=36), and forcibly silked major
ampullate fibers (FS; N=52). Diameters for the thicker and thinner
pair of fibers at the base of gumfooted lines are shown separately.