  We draw the three-flavor phase diagram as a function of light- and
strange-quark masses for both zero and imaginary quark-number chemical
potential, using the Polyakov-loop extended Nambu-Jona-Lasinio model with an
effective four-quark vertex depending on the Polyakov loop. The model
prediction is qualitatively consistent with 2+1 flavor lattice QCD prediction
at zero chemical potential and with degenerate three-flavor lattice QCD
prediction at imaginary chemical potential.
