  We investigate the production of the Phi meson and the Omega baryon which
interact weakly with hot hadronic matter, and thus their spectra reflect the
early stage of the heavy ion collisions. Our analysis shows that the
hadronization temperature, T_had, and the transverse flow, v_T, of the initial
deconfined phase are strongly correlated: T_had + a * (v_T)**2 = 0.25 GeV,
where a=0.37 GeV in the Pb+Pb collision at 158 AGeV/c. When choosing
appropriate initial values of T_had and v_T from the temperature region
T_had=175 +- 15 MeV, the measured Rho meson spectra was reproduced surprisingly
well by the MICOR model. We have found weak influence of final state hadronic
interactions on the transverse hadron spectra at m_T - m_i > 0.3 GeV.
