Wrapping around the Milky Way , the Sagittarius stream is the dominant substructure in the halo .
Our statistical selection method has allowed us to identify 106 highly likely members of the Sagittarius stream .
Spectroscopic analysis of metallicity and kinematics of all members provides us with a new mapping of the Sagittarius stream .
We find correspondence between the velocity distribution of stream stars and those computed for a triaxial model of the Milky Way dark matter halo .
The Sagittarius trailing arm exhibits a metallicity gradient , ranging from -0.59 dex to -0.97 dex over 142 ^ { \circ } .
This is consistent with the scenario of tidal disruption from a progenitor dwarf galaxy that possessed an internal metallicity gradient .
We note high metallicity dispersion in the leading arm , causing a lack of detectable gradient and possibly indicating orbital phase mixing .
We additionally report on a potential detection of the Sextans dwarf spheroidal in our data .