Table 1.

Summary of instantaneous speed and motion time.

strain	measurement	control experiments			under 1.0mT magnetic field
		run	reverse	tumble	run	reverse	tumble
WT	Instantaneous speed (µm/s)	36.08±11.59	18.03±10.01	8.17±5.44	21.96±7.87	21.14±9.77	7.73±4.45
	Motion time(s)	3.26±3.66	0.36±0.22	0.20±0.20	3.61±4.84	0.77±1.20	0.20±0.43
	λ*	−0.0704	−2.0868	−1.3966	−0.0502	−0.13411	−0.3342
	R2*	0.7110	0.9075	0.8255	0.5887	0.3432	0.3474
Δamb0994−0995	Instantaneous speed (µm/s)	37.76±11.42	20.08±8.05	7.87±4.81	41.07±12.95	20.52±7.57	7.66±6.75
	Motion time(s)	3.25±3.77	0.53±0.36	0.10±0.09	1.92±2.14	0.40±0.25	0.11±0.12
	λ	−0.0592	−0.5972	−3.4947	−0.1546	−1.0656	−2.2249
	R2	0.3841	0.6592	0.8821	0.8185	0.8232	0.8065
Δamb2196	Instantaneous speed (µm/s)	35.63±10.87	24.38±7.46	8.32±5.99	35.02±10.36	22.52±6.65	4.60±4.00
	Motion time(s)	4.06±3.87	0.54±0.35	0.17±0.16	3.19±3.78	0.69±0.49	0.08±0.06
	λ	−0.0698	−0.5224	−1.8461	−0.0658	−0.2333	−4.7567
	R2	0.7743	0.6532	0.8710	0.5130	0.2690	0.9850
Camb0994−0995	Instantaneous speed (µm/s)	44.02±15.6	24.24±9.59	9.18±6.35	39.14±13.44	35.23±13.51	7.39±6.41
	Motion time(s)	2.91±2.56	0.65±0.84	0.21±0.28	2.74±3.08	0.71±0.69	0.24±0.38
	λ	−0.12607	−0.22865	−0.8315	−0.10087	−0.26635	−0.4572
	R2	0.8778	0.52358	0.62426	0.65645	0.52165	0.42398

^*The tail parts of the distributions (in semilog scale) were fitted linearly: log₁₀y = λx + b where λ is the slope of the linear fit. This equation can be transformed into exponential distribution y=(10^b)·10^λx λ̣ is the parameter characterizing the decay rate in the exponential distributions. Larger absolute value of λ indicates faster decay of the distribution. R² is the coefficient of determination of linear fit for the tail of semilog data³¹.