Picture shows qun or shorter section on the top which is nine fen. Lower section is chi or longer section is 1 qun or 10 fen. "Gate" guang is a line between two sections. Positions of fingers for pulse examination are red circles, point Taiyuan is blue circle.
Different modern authors explained that qun section is placed over point Taiyuan 9 Lung, that contradict original point of Nan Jing
Same name of the position of the index finger is shorter then one qun and has it's name of qun only because it has place one qun under the wrist. It can't be point Taiyuan 9 of lung meridian
I addition points waiguang 5SJ and neiguang 6P have same radical "Gate" guang as line between qun and chi and are situated on the same level where second finger should be placed to exam the pulse
Have a nice pulse exam
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