  We employ a data-driven method to subtract the flow background of all
harmonics by calculating the difference of the two-particle correlations
between the close-region and far-region, determined depending on the
pseudo-rapidity ($\eta$) distance from the region where an enhanced recoil
transverse momentum ($P_x$) from a high-$p_T$ trigger particle is selected. We
analyze the correlation shape as a function of the trigger particle azimuthal
angle relative to the event-plane (EP) reconstructed from the beam-beam
counters (BBCs) which are displaced by several units in $\eta$ from the
mid-rapidity region. The large $\eta$ gap can effectively eliminate the
auto-correlation between trigger particles and EP. We correct for the
relatively large resolution effect from the BBC EP determination via an
unfolding procedure. The width of unfolded away-side jet-like correlation
increases with longer path-length, which is an indication of jet-medium
interactions.
