Velocity space of local 1 kpc halo sample with significant clusters in the Thamnos region highlighted in different colours. We can see the sub-structure presents itself as tight clumps in v_ϕ and v_z. The bottom panel shows the LAMOST DR7 LRS metallicities (normalised such that the area sums to 1 and binned with a relative shift of 0.01 dex to aid comparison), indicating that some of these velocity sub-structures could be tight in terms of metallicity, but they always present some contamination from the [Fe/H] ~ −1.5 dex peak.