  Measurements of identified particle momentum spectra at center of mass energy
200 GeV are reviewed. Emphasis is placed on the azimuthal dependence and the
centrality dependence of hadron yields at intermediate transverse momentum (1.5
< p_T < 5 GeV/c). The first measurements of the fourth harmonic term (v_4) in
the azimuthal variation of identified particle yields are shown. The
recombination mechanism of hadron formation provides a consistent description
of the dependence of these measurements on particle-type.
