Mr. SHANEYFELT. This location was selected as the first point at which a person in the sixth floor window of the Book Building at our control point could have gotten a shot at the President after the car had rounded the corner from Houston to Elm. Mr. SPECTER. And what position is station C? Mr. SHANEYFELT. Station C is on a line drawn along the west curb line of Houston Street in a direct line, and station C is at a point along that line that is in line with where the car would have turned coming around that corner. It is on a line which is an extension of the west curb line of Houston Street. Mr. DULLES. Where is position A on that chart? Mr. SHANEYFELT. Position A is here. Mr. McCLOY. That is before you get to the tree? Mr. SHANEYFELT. Yes; he isn't under the tree yet. Mr. SPECTER. And what occupant, if any, in the car is position A sighted on for measuring purposes? Mr. SHANEYFELT. All of the photographs made through the rifle sight that are shown on the exhibit in the lower left-hand corner were sighted on the spot that was simulating the spot where the President was wounded in the neck. The chalk mark is on the back of the coat. Mr. SPECTER. When you say that position A is the first position at which President Kennedy was in view of the marksman from the southeast window on the sixth floor of the School Book Depository Building, you mean by that the first position where the marksman saw the rear of the President's stand-in? Mr. SHANEYFELT. That is correct. Mr. SPECTER. So that would be the first position where the marksman could focus in on the circled point where the point of entry on the President was marked? Mr. SHANEYFELT. That is correct. Mr. SPECTER. Could the marksman then have taken a shot at the President at any prior position and have struck him with the point of entry on that spot, on the base of the President's neck? Mr. SHANEYFELT. I don't quite understand the question. Mr. SPECTER. Was there any prior position, that is a position before position A, where the marksman from the sixth floor could have fired the weapon and have struck the President at the known point of entry at the base of the back of his neck? Mr. SHANEYFELT. No; because as the car moves back, you lose sight of the chalk mark on the back of his coat. Mr. SPECTER. And what is the distance between that point on the President and station C? Mr. SHANEYFELT. That is 44 feet from station C--91.6 feet to the rifle in the window from the actual chalk mark on the coat. All measurements were made to the chalk mark on the coat. Mr. SPECTER. On the coat of the President? Mr. SHANEYFELT. That is correct. Mr. SPECTER. The President's stand-in? Mr. SHANEYFELT. Right. The angle to the rifle in the window was 40°10´. Mr. SPECTER. And what is the other data? Mr. SHANEYFELT. The distance to the overpass was 447 feet, and the angle to the overpass was minus O°27´; that is, 27´ below the horizontal.