I am using Cytoscape 3.2.1. For each of my node, I have 2 numeric attributes A and B, with A bigger than B. For example the node represents a city; attribute A represents the whole population of the city and B represents the population of male. I want to display the node with two nested circles, the bigger outer one with size (maybe also color) according to A, and the the inner one according to B. Is there any way to reach this goal?