This function first calculates the network density for each dispersal parameter specified by the user. Network density compares the number of available links in a network versus the total number of possible links in the same network. Network density is a measure of how well an entire network is, ranging from 0 (not connected at all) to 1 (fully connected). This function then compares visually how network density changes with changes in dispersal parameter values. In other words, it calculates and plots the network density of a GeoNetwork object.