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(a) Snapshots of a L4-stage N2 C. elegans whose body positions and centroid are tracked by a worm tracking program. The tracks show the relative levels of difficulty faced by the worm in the different sections of the channel [(i): lower cut-off region, (ii): adaptable region, and (iii): higher cut-off region (see Ref. 29)] (b) Representative tracks of the body centroid for C. elegans (N2, lev-8 and unc-38) along the modulated sinusoidal channel.
