Radial velocity and metalicity distributions for either components of Jhelum. Top panel: distribution of the radial velocities around the best-fit orbit of each component of the stream. The width of these distributions helps us visualize the velocity dispersion σ_v for the broad component, and for the narrow component. Lower panel: distribution of metallicities, [Fe/H], for either component of the stream. Metallicity measurements are obtained from the S⁵ survey. The intrinsic width of these distributions is fitted to a Gaussian distribution, to find the metallicity dispersion of each component. This calculation is explained in Sect. 5.4. We also indicate the mean error on the metallicity measurements, .