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Line a is parallel to the long axis of the zygomatic arch. It denotes the distance from the bifurcation point to the posterior edge of the mandibular condyle. Line b is the vertical distance from the STA bifurcation point to the upper edge of the zygomatic arch. Line c is the distance from the STA bifurcation point to the zygomatic process of the frontal bone. Line c is in parallel with line a. STA, superficial temporal artery.
