Observables of S3 BHB and BS data from N19 (white points and squares, respectively, with black error bars), neural network candidates (grey points and error bars), and the stream model (coloured points). The rows show the stream track, its heliocentric distance, radial velocity in the Galactic standard of rest, and proper motions, not reflex-corrected, respectively. The left (right) column shows model streams with a progenitor distance of 75 kpc (45 kpc). The colours refer to the progenitor’s Galactic standard of rest radial velocities (see the colour bar in the top-left panel). The streams at the larger distance (75 kpc) match the data well, particularly with a radial velocity of 50 km s⁻¹. The closer progenitors (45 kpc) fail to produce streams that cover the whole range of all observables in ϕ₁.