These four components of the phase limit set correspond to the four rays of
the tropical variety (here a fan) of the plane.
It is interesting to note that the union of (the closures of) these four
components of the phase limit set is the (closure of) the coamoeba, and a
general point of the coamoeba lies in exactly two of these phase limit sets.
There are higher-codimensional pieces of the phase limit set which correspond
to the six two-dimensional cones in the tropical fan.
Each of these is a 2-dimensional subtorus, which is one of the six facets
of the coamoeba.
Observe that parts of these components are on the boundary of the coamoeba,
and parts lie within the interior of the coamoeba.
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