Combined S0-2 spectrum (⁠|$s = 11$|⁠) around the Br-|$\gamma$| absorption line, obtained with Subaru/IRCS from 2014 to 2017. We can see a He i absorption line at |$2.16137\, \mu$|m as well as the Br-|$\gamma$||$2.16612\, \mu$|m line. The Br-|$\gamma$| line is fitted with a Moffat function (red curve). (Color online)