The contents of this graph will come as a surprise to no one, I suspect but 1) It's in 3-D and 2) It took me absurdly long time to add even passable yet thoroughly homemade-looking labels. So I'll share.
And I'll summarize: The Hawks are 10.1 points/100 possessions better at home than they are on the road. At the Hawks' average pace (89.8 possessions per game) that converts to 9.1 points per game.
As always, click the image to make it bigger.
I have not expanded my study to figure out how much better the average NBA team is at home. Perhaps another day.