Identification of Sagittarius stream members in Angular Momentum space
  with Gaussian mixture techniques
  This paper uses Gaussian mixture techniques to dissect the Milky Way (MW)
stellar halo in angular momentum space. Application to a catalogue of 5389
stars near the plane of the Sagittarius (Sgr) stream with full 6D phase-space
coordinates supplied by Gaia EDR3 and SEGUE returns four independent dynamical
components. The broadest and most populated corresponds to the `smooth' MW
halo. The narrowest and faintest contains 40 stars of the Orphan stream. We
find a component with little or no angular momentum likely associated with the
GSE substructure. We also identify 925 stars and 7 Globular Clusters with
probabilities $>90\%$ to be members of the Sgr stream. Comparison against
$N$-body models shows that some of these members trace the continuation of the
leading/trailing tails in the Southern/Northern hemispheres. The new detections
span $\sim 800^\circ$ on the sky, thus wrapping the Galaxy {\it twice}.
