Fig. 3.

Picture or photograph demonstrating the three reference points of the triangular electromagnetic field. (a) A triangular electromagnetic field is created by selecting three reference points. Reference points A is located ≤2 mm medial to the right lateral canthus, point B is located ≤2 mm medial to the left lateral canthus, point C is located 2 mm from the base of the nasal philtrum, point D is a reference point where callipre is located. (b) Triangular mapping of the patient’s face