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The lovely light
green ellipses are
solitaries not part of
a cluster. There
were a lot more
clusters than
colors, so our
apologies for the use
of one color (like
orange) to represent
more than one
cluster. We did
experiment with
using rectangles as
well as ellipses - this
was not a visual
success. Also, some
of the larger
clusters have so
many events there is
no room to draw
enough markers.  
Our software roughly defines the clusters in terms of two
latitudes and two longitudes. Drawing these rectangles was
simple, but the resulting visual was intensely disliked by
almost all viewers: besides the introduction of obvious
artifacts, it was difficult to tell how many events were in
the cluster.