v_ϕ vs. [M/H] for the all of the stars in our sample, without (top) and with (bottom) a zero-point correction of 0.054 mas on the parallaxes. The uncertainties in v_ϕ and [M/H] for stars in bins of [M/H] are shown in green at the bottom of the plots. The colour code corresponds to the mean Galactocentric radius of the stars with and without the zero-point correction. Contour lines enclose 33%, 66%, 90%, and 99% of the sample. Dashed grey line denotes the region where v_ϕ = 0 km s⁻¹.