Chemical abundance of the Helmi stream stars from literature, namely Roederer et al. (R10; 2010), Aguado et al. (A21; 2021), and Gull et al. (G21; 2021). We also include Helmi stream stars in the present study and in NS10. The background gray points are from the SAGA database (Suda et al. 2008, 2011; Yamada et al. 2013). The UVES spectra of three stars from Aguado et al. (2021) were reanalysed and abundances from the reanalysis are included in the figure. Abundances from our reanalysis and those from Aguado et al. (2021) are connected with a solid line for each star.