Completeness and purity of the groups of clusters as a function of the Mahalanobis distance threshold (D_M,th) chosen to group clusters together. For the purity, the solid lines represent the purity defined as the average cluster purity within groups (𝒫_cg), while the dashed lines indicate the average purity of the groups (𝒫_g). The threshold values used by L22 and D23 are indicated by the vertical dashed and solid lines, respectively. Note that the completeness and purity reported here only refer to the accreted progenitor. Stellar particles formed in situ are excluded (see Sect. 4.3).