  Two-dimensional angular correlation data from the STAR experiment at RHIC and
from the LHC experiments provide critical information about dynamical processes
in relativistic heavy-ion collisions. The principal correlation structures of
interest are a broad jet-related peak at small relative azimuth ($\phi$)
extending to large relative pseudorapidity ($\eta$), the dijet ridge at large
relative azimuth, and an independent double ridge on $\phi$ represented by a
quadrupole function. The broad peak at small relative azimuth has been
attributed, in large part, to initial-state fluctuations and hydrodynamic flow
which produce higher-order harmonics on $\phi$. That conjecture is challenged
in this paper. It is shown that the net effect of additional higher harmonic
model elements is to describe small, non-Gaussian (NG) shapes in the broad
jet-related peak. The quadrupole correlation, which is also conventionally
attributed to hydrodynamic flow, is considered within the Balitsky - Fadin -
Kuraev - Lipatov (BFKL) Pomeron framework. Preliminary results using this model
for the quadrupole correlation for particle production from 200 GeV $p+p$
collisions are shown to be consistent with recent data from STAR.
