  In 2018, in preparation for the Beam Energy Scan II, the STAR detector was
upgraded with the Event Plane Detector (EPD). The instrument enhanced STAR's
capabilities in centrality determination for fluctuation measurements, event
plane resolution for flow measurements and in triggering overall. Due to its
fine radial granularity, it can also be utilized to measure pseudorapidity
distributions of the produced charged primary particles, in EPD's
pseudorapidity coverage of $2.15<|\eta|<5.09$. As such a measurement cannot be
done directly, the response of the detector to the primary particles has to be
understood well. The detector response matrix was determined via Monte Carlo
simulations and corrected charged particle pseudorapidity distributions were
obtained in Au+Au collisions at center of mass collision energies
$\sqrt{s_{_{NN}}}$ = 19.6 and 27.0 GeV using an iterative unfolding procedure.
Several systematic checks of the method were also done.
