  Utilizing rapidity-dependent measurements to map the QCD phase diagram
provides a complementary approach to traditional beam-energy-dependent
measurements around midrapidity. The changing nature of thermodynamic
properties of QCD matter along the beam axis in heavy-ion collisions at low
collision energies both motivates and poses challenges for this method. In this
study, we derive the analytical cumulant-generating function for subsystems
within distinct rapidity windows, while accounting for global net-baryon charge
conservation of the full system. Rapidity-dependent net-baryon cumulants are
then calculated for a system exhibiting inhomogeneity along the beam axis, and
their sensitivity to finite acceptances through changing rapidity bin widths is
explored. We highlight the nontrivial behaviors exhibited by these cumulants,
underscoring their importance in establishing a noncritical baseline for
interpreting net-proton cumulants in the search for the QCD critical point.
Finally, we discuss the implications of the rapidity scan for mapping the QCD
phase diagram within the current context.
