Fig. 8.

The Goertzel filter results for the x [red, $({\overline{\mathit{v}}}^{\text{RX}})$], y [blue, $({\overline{\mathit{v}}}^{\text{RY}})$] and z [green, $({\overline{\mathit{v}}}^{\text{RZ}})$] gradient excitations plotted in the WRAD co-ordinate frame.