  The thermal model is commonly used in two different ways for the description
of hadron production in ultra-relativistic heavy ion collision. One is the
application of the thermal model to 4pi integrated data and the other is the
thermal description of central dN/dy ratios. While the first method implicitly
assumes global equilibrium the other scenario assumes Bjorken scaling within
the investigated rapidity range. Both assumptions are only approximations for
real physical collision systems. We study the impact of both approximations for
the extraction of thermal parameters on the exemplary case of S+S collisions at
SPS energies. The particle distributions are modeled by a hydrodynamical
description of the relevant collision system.
