Then we start action. When the action is started, a spark gap gets discharged by the spark gap electrode and this extra corporeal shock wave lithotripsy, like Dr. Zabbo also mentioned in the physics presentation a few minutes ago, is going to go by this ellipsoidal deflector to the F2 point. This is actually what you'd like to do ideally, and you have to spend some time, especially when in the learning curve, to keep this point every time available for you because we're going to use roughly 1,500 to 2,000 shock waves. If you start to shock wave the patient after you find this point all the way down 2,000 you might make a mistake, so that's the reason I'm really reemphasizing that this point should be in your focus every time. Please take your time. You may use the 300, 500, or you might use some other number for yourself and then look again at the computer: this at the 2 point is still there. If the patient moves a little bit, it might be difficult.
One other thing is very important. Our maximum effective F2 point is plus and minus 2-centimeters in the system, so even at 2 point, you might be around 1-centimeters out. You're still in pretty good shape but don't do this thing out of the 2-centimeters