Figure 4.

Acquisition configuration of rotational displacements around the (a) x-axis, (b) y-axis, and (c) z-axis, starting at a distance of about 700 mm from the reference position R0; (d) representation of rotational displacements R_i (i = 1,…,11) and variations ($\Delta R$, i.e., differences between rotational displacements $i^{\mathrm{th}}$ and $i^{\mathrm{th}-1}$.