  The centrality dependencies of the inclusive neutral pion and prompt photon
nuclear modification factors for p+Pb collisions at the LHC are studied using a
spatially dependent set of nuclear PDFs, EPS09s. The calculations are performed
at mid- and forward rapidities searching for an observable which would
optimally probe the spatial dependence of the nuclear PDFs. In addition, we
discuss to which $x$ values of the nucleus the different observables are
sensitive.
