The graph on the left shows all the scoring stat values for all the teams in your league. Right is better. The first row shows totals, and the other rows show individual stats. The thin lines represent other teams, and the thick line is your own team, or the team selected on the right in the lineup page. If you mouse over the lines you can see which team they represent and their values. You can also filter out by team using the dropdown. Head to head leagues already have this selected. These values are updated in real time, so if you make lineup movements on the right you can see the values being adjusted on the left.