This is the fiddle.
For some reason, the colors of some groups do not match the value of size
.
For instance, I checked "name":"flare.analytics.cluster.AgglomerativeCluster","size":3938
. In the drawing it's marked in "pink-red" color which corresponds to the legend > 5000 (scroll right to see the legend). According to my understanding it should be marked in the color of the legend 2000
.