Table S1.

Statistics of image processing

Feature	Value
Pixel size on the specimen, Å	2.11
Resolution at Fourier shell correlation = 0.5, Å	9.8
Resolution at Fourier shell correlation = 0.143, Å	8.3
Total length of nonoverlapping segments, nm	13,361
Number of fibrils	11
Total number of contributed subunits	28,488
Scoring function step size, nm	6.7
Size of reconstruction, nm	60.77
Crossover distance, nm	57.68
Repeat distance, nm	0.469
Fibril width, nm	8.89
Cross-sectional area, nm2	40.43
Size of the segment, nm	5.2–6.7