Table 1.

Intensity, spacing, and radial width (full width at half-maximum) of the M3 and M6 reflections at sarcomere length 2.0–2.2 μm, at rest and during active contraction

	M3			M6
	Intensity	Spacing, nm	Width, nm−1	Intensity	Spacing, nm	Width, nm−1
Resting	1	14.341  ± 0.007	0.007  ± 0.002	0.25  ± 0.05	7.157  ± 0.005	0.005  ± 0.001
Active	2.64  ± 0.43	14.573  ± 0.007	0.016  ± 0.001	0.42  ± 0.06	7.286  ± 0.006	0.015  ± 0.003

Intensities were measured with narrow integration limits (see Methods), corrected for width changes as described in the text, and normalized to the resting M3 intensity. Means ± SD, 4 fibers.