  One of the physics goals of the NA61/SHINE collaboration at the CERN Super
Proton Synchrotron is to study the phase diagram of hadronic matter. To this
end, a series of heavy ion collision measurements are performed. It is believed
that above a certain collision energy and system size a phase transition
between hadronic matter and quark-gluon plasma occurs. A number of observables
has been developed to determine which of the phases was created at the early
stage of the collision. This report discusses the dependence of the ratio of
the mean number of produced pions to the mean number of wounded nucleons on the
Fermi energy measure. For comparison with other measurements this is often
presented in the form of the the "kink" plot. This plot is presented enriched
with preliminary results for Ar+Sc central collisions at 13A, 19A, 30A, 40A,
75A and 150A GeV/c beam momentum. The results are finally compared to data from
other experiments.
