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Gribov's theory of light quark confinement implies the existence of two kindsof scalar bound states. The phase diagram of the three-flavor QCD is mapped outin the (m_pi-m_K)-plane with help of the SU_L(3)xSU_R(3) linear sigma modelsupplemented with the assumption that the masses of the so-called superboundscalars do not change under the variation of the pion and kaon mass. The phaseboundary along the m_pi=m_K line is found in the interval 15 MeV<m_crit<25 MeV,irrespective which f_0-sigma linear combination is identified with the puresuperbound state.Comment: 11 pages, 3 figures, presented at the Gribov-75 Memorial Workshop on  Quarks, Hadrons, and Strong Interactions, Budapest, Hungary, 22-24 May 200

SENSITIVITY OF THE CHIRAL PHASE TRANSITION OF QCD TO THE SCALAR MESON SECTOR