  We discuss systematic uncertainties in the chemical freeze-out parameters
from the $\chi^2$ analysis of hadron multiplicity ratios in the heavy-ion
collision experiments. The systematics due to the choice of specific hadron
ratios are found to lie within the experimental uncertainties. The variations
obtained by removing the usual constraints on the conserved charges show
similar behavior. The net charge to net baryon ratios in such unconstrained
systems are commensurate with the expected value obtained from the protons and
neutrons of the colliding nuclei up to the center of mass energies $\sim 40$
GeV. Beyond that the uncertainties in this ratio gradually increases, possibly
indicating the reduction in baryon stopping.
