  A recently proposed method, based on quadrupole and multiplicity fluctuations
in heavy ion collisions, is modified in order to take into account distortions
due to the Coulomb field. This is particularly interesting for bosons produced
in heavy ion collisions, such as $d$ and $\alpha$ particles. We derive
temperatures and densities seen by the bosons and compare to similar
calculations for fermions. The resulting energy densities agree rather well
with each other and with the one derived from neutrons. This suggests that a
common phenomenon, such as the sudden opening of many reaction channels and/or
a liquid gas phase transition, is responsible for the agreement.
