  We investigate the behavior of the spectral weight near the Fermi level of
NdNiO3 thin films as a function of temperature across the metal-to-insulator
transition (MIT) by means of ultraviolet photoelectron spectroscopy. The
spectral weight was found to exhibit thermal hysteresis, similar to that of the
dc conductivity. A detailed analysis of the temperature dependence reveals two
distinct regimes of spectral loss close to the Fermi level. The temperature
evolution of one regime is found to be independent from the MIT.
