  It is shown how to embed a critical point in a smooth background equation of
state so as to yield the critical exponents and critical amplitude ratios
expected of a transition in the same universality class as the liquid-gas phase
transition and the 3D Ising model. There are only two independent critical
exponents; the relations $\alpha + 2\beta + \gamma = 2$ and $\beta (\delta - 1)
= \gamma$ arise automatically, as does a new relation between the two critical
amplitudes. The resulting equation of state has parameters which may be
inferred by hydrodynamic modeling of heavy ion collisions in the Beam Energy
Scan II at the Relativistic Heavy Ion Collider.
