fig15

Figure 15. Final-frame images of reference points in the target picking domain under different axial directions. (A) Point a₁ in the positive X₀-axis direction; (B) Point a₂ in the positive X₀-axis direction; (C) Point a₃ in the positive X₀-axis direction; (D) Point a₄ in the positive X₀-axis direction; (E) Point a₁ in the negative Y₀-axis direction; (F) Point a₂ in the negative Y₀-axis direction; (G) Point a₃ in the negative Y₀-axis direction; (H) Point a₄ in the negative Y₀-axis direction. Photograph taken by the authors.