  We analyze the sensitivity of thermal fits to heavy-ion hadron yield data of
ALICE and NA49 collaborations to the systematic uncertainties in the hadron
resonance gas (HRG) model related to the modeling of the eigenvolume
interactions. We find a surprisingly large sensitivity in extraction of
chemical freeze-out parameters to the assumptions regarding eigenvolumes of
different hadrons. We additionally study the effect of including yields of
light nuclei into the thermal fits to LHC data and find even larger sensitivity
to the modeling of their eigenvolumes. The inclusion of light nuclei yields,
thus, may lead to further destabilization of thermal fits. Our results show
that modeling of eigenvolume interactions plays a crucial role in
thermodynamics of HRG and that conclusions based on a non-interacting HRG are
not unique.
