  QCD phase diagram is obtained by analysing centrality dependence of $J/\psi$
suppression in $\snn$=17.3 Pb+Pb and $\snn$=200 GeV Au+Au collisions.
$J/\psi$'s produced in initial interactions are assumed to dissolve if local
temperature exceeds a threshold temperature. The threshold temperature depends
on the (local) fluid temperature and baryonic chemical potential, which are
obtained, under certain assumptions, from experimentally determined quantities
e.g. rapidity density, net baryon density. QCD critical line with curvature
parameter $\kappa\approx 0.018-0.23$ is consistent with experimental $J/\psi$
data. $\kappa$ is factor of $\sim$3 larger than in lattice QCD calculations.
