1
There were eight green dots actually fully inside the box, but the dot is just the center of the ball and the rulebook strikezone calls for anything that touches the zone to be called a strike. That means if you made those dots ball sized, you'd get a much higher number of blown calls.
Those dots come from brooks baseball.
http://brooksbaseball.net
Very user friendly web site. But they need to differentiate between called strikes, swinging strikes and fouled strikes.