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This point is on the GV channel, 0.8 cun above the posterior hairline. Some books state it overlaps with Fengfu (GV 16), which is 1 cun above the midpoint of the posterior hairline, while others say it overlaps with Yamen (GV 15), which is 0.5 cun above the midpoint of the posterior hairline.
Needle 0.1-0.2 cun.
This point works best when it is bled. Pinch the muscles first prior to bleeding.