  We examine how the effect of hollowness in pp scattering at the LHC (minimum
of the inelasticity profile at zero impact parameter) depends on modeling of
the phase of the elastic scattering amplitude as a function of the momentum
transfer. We study the cases of the constant phase, the Bailly, and the so
called standard parameterizations. It is found that the 2D hollowness holds in
the first two cases, whereas the 3D hollowness is a robust effect, holding for
all explored cases.
