The data for the west coast is rather unexpected for me. Does anyone have any insight into that? Maybe this is a case of my intuitive sense of the size of NYC really not doing reality justice?
Are you talking about the sample image in the readme? I don't think it says what repository that data corresponds to. The guy is also New York based so it might just be that his github social network is skewed to the right coast.
The image is from the live demo[1], which says it's from rviscomi/trunk8.