Top: column-normalised (by sum) 2D histogram of stars in the [M/H]−η plane (orbital circularity vs metallicity, top) and [M/H]−v_ϕ plane (azimuthal velocity vs metallicity, middle bottom) for all the stars (right), high-α selection (left), and low-α selection (midde). The running median track is shown as dashed black line and the 16th and 84th percentile tracks are shown as black lines in all panels. The running median tracks for the all stars and low-α panels look more like a step-function, while the high-α tracks are shallower, supporting the more gradual spin-up phase with respect to metallicities. (middle top) Probability density functions (PDF) of η in bins of [M/H] for all the stars (right), high-α selection (left), and low-α selection (middle). (bottom) Probability density functions (PDF) of v_ϕ in bins of [M/H] for all the stars (right), high-α selection (left), and low-α selection (middle). We note the second peak with low net spin in high-α panel slowly gains rotation with increasing [M/H] and spins-up into the old high-α disc in both middle top and bottom panels.