  This comment clarifies the mixed definition of the cerium valence in the
article entitled: Quantitative study of the $f$ occupation in CeMIn5 and other
cerium compounds with hard X-rays, published in Journal of Electron
Spectroscopy and Related Phenomena
http://www.sciencedirect.com/science/article/pii/S0368204816300123 and
available on arXiv:1601.03270. Indeed, it is unclear wether electrons belonging
on hybridized f-states are part or not of the valence. When one tries to
simulate the system, an Anderson impurity model only includes valence bands
electrons and localized 4-f states. Therefore hybridized 4-f states are mixed
with the localized ones. From a heavy fermion perspective it however essential
to differentiate hybridized and localized states as only the second are
responsible for strong correlations, such as obtained by susceptibility or
direct comparisons to model systems.
