This PDF file includes:

• Section S1. The dwell time distribution for the two-state model
• Section S2. The dwell time distribution for the three-state model
• Fig. S1. The motor speed at high load as a function of the number of stators.
• Fig. S2. The distributions of stator number for motors at steady states at various induction levels.
• Fig. S3. The dwell time distribution at stator numbers from 1 to 11 for JY21 induced with 0, 2, and 5 μM IPTG (from left to right).
• Fig. S4. The dwell time distributions for two types of intervals.
• Fig. S5. The dwell time distributions for the two types of “On” intervals.
• Fig. S6. The dwell time distribution at stator numbers from 1 to 11 for the wild-type strain JY27.
• Fig. S7. Data from the MotB plug-deletion strain (SM1 carrying pBAD33MotBΔplug) with induction of 0.001% arabinose.
• Fig. S8. Other possible three-state models.
• Fig. S9. An example of simulated speed trace analyzed by the step-finding algorithm.
• Fig. S10. The interval distributions from the simulated traces using different values of the parameters v_m and t_m in the step-finding algorithm.

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