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| Triangles | Facial features (markers) |
|---|---|
| Triangle 1 (T1) | p_e1, p_e2 & C (centre) |
| Triangle 2 (T2) | p_e3, p_e4 & C (centre) |
| Triangle 3 (T3) | p_m1, p_m2 & C (centre) |
| Triangle 4 (T4) | p_m1, p_m3 & p_m4 |
| Triangle 5 (T5) | p_m2, p_m3 & p_m4 |
