  The presence of multiple bipartite entangled modes in squeezed states
generated by four wave mixing in atomic vapors enables ultra-trace sensing,
imaging, and metrology applications that are impossible to achieve with
single-spatial-mode squeezed states. For Gaussian seed beams, the spatial
distribution of bipartite entangled modes, or coherence areas, across each beam
is largely dependent on the spatial modes present in the pump beam, but it has
proven difficult to map the distribution of these coherence areas in frequency
and space. We demonstrate an accessible method to map the distribution of the
coherence areas within these twin beams. We also show that the pump shape can
impart different noise properties to each coherence area, and that it is
possible to select and detect coherence areas with optimal squeezing with this
approach.
