Normalised histograms of Galactic heights, z, the Galactic-longitude component, v_l, and the Galactic-latitude component, v_b, of transverse peculiar velocities, shown, respectively, in the left, middle, and right panels. The normalised histograms have been smoothed with kernel density estimation (using scipy.stats.Gaussian_kde). Each histogram is concatenated from 10000 simulations drawn from the assumed split normal distributions for the measurements (of z, v₁ or v_b; see Table B.1). The black, magenta, and yellow curves correspond to the full sample (of 64 field MSPs) and two high-precision samples (see Appendix B), respectively.