Table 2.

Acquisition protocols followed in this study.

experimental design	channel	frame rate (fps)	magnification	purpose
no constrain, no flow	BF & FLUO	1	5×	movement, traction stress under sucker
no constrain, with flow	BF & FLUO	1	5×	traction stress under sucker
constrain, no flow	BF & FLUO	1	2×	movement and body wave, traction stress under body and sucker
constrain, no flow	BF	10	2×	higher temporal resolution of body wave
constrain, no flow	BF	100	5×	velocity of material points on the body