Abundance ratio ([X|$/$|Fe]) of LAMOST J011939.222−012150.45 compared with the chemical composition predicted from different AGB models with metallicity [Fe|$/$|H] = −2.6. The solid line represents the best-fit model, with the initial mass |$M_{\,\rm ini} = 1.4\, M_{\odot }$| and cases ST|$/$|6. Two other models are shown for comparison, with |$M_{\,\rm ini} = 1.4\, M_{\odot }$| and ST|$/$|9 (dashed line), and |$M_{\,\rm ini} = 1.3\, M_{\odot }$| and ST|$/$|6 (dash-dotted line), respectively, as displayed in Bisterzo et al. (2010). ST|$/$|6 and ST|$/$|9 refer to the cases dividing the ¹³C abundances in the pocket of the standard model (Arlandini et al. 1999) by factors of 6 and 9, respectively. The circles with error bars indicate the observational abundances. (Color online)