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Table 1.

Regression results for selected parameters

Comparison	Regression type	F	P	R²
L_ω/D_ω on U	L	11.053	0.002^*	0.262
L_v/D_F on U	L	13.268	0.001^*	0.300
U_j/U on U	P	37.431	<0.0001^*	0.609
U_jmax/U_max on U	P	28.836	<0.0001^*	0.487
U_j on U	L	0.013	0.910	–
U_jmax on U_max	L	0.105	0.748	–
Pulse duration on U	L	18.016	<0.001^*	0.368
I on L_ω/D_ω	L	11.642	0.002^*	0.273
I on U	L	27.758	<0.0001^*	0.472
F̃_T on L_ω/D_ω	L	0.590	0.448	–
F̃_T on U	L	1.632	0.211	–
η_pc on U	P	41.753	<0.0001^*	0.574
η_pd on U	P	35.521	<0.0001^*	0.533
η_pc on L_ω/D_ω	L	0.626	0.435	–
η_pd on L_ω/D_ω	L	0.721	0.402	–
Γ on time	L	44.799	<0.0001^*	0.258

Comparison	Regression type	F	P	R²
L_ω/D_ω on U	L	11.053	0.002^*	0.262
L_v/D_F on U	L	13.268	0.001^*	0.300
U_j/U on U	P	37.431	<0.0001^*	0.609
U_jmax/U_max on U	P	28.836	<0.0001^*	0.487
U_j on U	L	0.013	0.910	–
U_jmax on U_max	L	0.105	0.748	–
Pulse duration on U	L	18.016	<0.001^*	0.368
I on L_ω/D_ω	L	11.642	0.002^*	0.273
I on U	L	27.758	<0.0001^*	0.472
F̃_T on L_ω/D_ω	L	0.590	0.448	–
F̃_T on U	L	1.632	0.211	–
η_pc on U	P	41.753	<0.0001^*	0.574
η_pd on U	P	35.521	<0.0001^*	0.533
η_pc on L_ω/D_ω	L	0.626	0.435	–
η_pd on L_ω/D_ω	L	0.721	0.402	–
Γ on time	L	44.799	<0.0001^*	0.258

L is linear regression, P is power regression, d.f.=1, 31 for all comparisons and ^* denotes significance. L_ω is jet length based on the vorticity extent, D_ω is the distance between vorticity peaks, U is the mean swimming speed during mantle contraction, L_v is the jet length based on the velocity extent, D is maximum diameter of the funnel, U_j is the mean jet velocity along the jet centerline, U_jmax is the peak jet velocity along the jet centerline, U_max is the peak swimming speed, I is the jet impulse, F̃_T the jet thrust time-averaged over the mantle contraction, η_pc is the convolved propulsive efficiency, η_pd is the deconvolved propulsive efficiency and Γ is jet vortex circulation

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