[Ca/Fe] vs. [M/H] colour-coded with [Ce/Fe] abundances for the identified candidate accreted stars. Circles, stars, and diamonds represent stars belonging to Thamnos, the Helmi Stream, and GSE, respectively. The filled symbols refer to the stars that were selected as good member candidates because of their lower [Ca/Fe], and the empty symbols are the rejected candidates. The density plot in the background are stars from the solar neighbourhood (see text for more details).