Fig. 2.

a) Illustration of a deflected needle separated in i-segments. Each segment is defined within its own (x_i’,y_i’,z_i’) frame can then be expressed in the laboratory frame (x,y,z). b) Schematic of a (x_i’,y_i’,z_i’) frame cross-section showing the angle between x_i’ and the rotational axis (α_i), the distance between the center of the fiber triplet and the rotational axis (r_i) as well as the angle between each fiber (φ_ijk), Figure adapted from [24].