Mr. Jarman. Yes.
Mr. Ball. At that time could you see the stairwell when you stood there at Z?
Mr. Jarman. No, sir; I couldn't.
Mr. Ball. Why?
Mr. Jarman. Because there is a row of bins there with books in them.
Mr. Ball. They block your view?
Mr. Jarman. Yes, sir.
Mr. Ball. And did we conduct an experiment there to see how much you could see from Z?
Mr. Jarman. Yes, sir.
Mr. Ball. I show you a picture, 491. Do you remember standing in line near the stairwell?