  The dependence of multi-proton correlation functions and cumulants on the
acceptance in rapidity and transverse momentum is studied. We find that the
preliminary data of various cumulant ratios are consistent, within errors, with
rapidity and transverse momentum independent correlation functions. However,
rapidity correlations which moderately increase with rapidity separation
between protons are slightly favored. We propose to further explore the
rapidity dependence of multi-particle correlation functions by measuring the
dependence of the integrated reduced correlation functions as a function of the
size of the rapidity window.
