Large Intestine Channel

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Which point is shown in the image below?
LI-20 is located in the nasolabial groove, level with the midpoint of the lateral border of the ala nasi.

Source: "The Large Intestine Channel of Hand Yangming." A Manual of Acupuncture, by Peter Deadman et al., Journal of Chinese Medicine Publications, 2007, p. 120 [Q178]