This was found to run elapsed time from the film standpoint which runs at 18.3 frames a second, runs for a total of 8.3 seconds. This distance is 136.1 feet, and this can be calculated then to 11.2 miles per hour. Mr. SPECTER. Is that a constant average speed or does that speed reflect any variations in the movement of the car? Mr. SHANEYFELT. That is the overall average from 161 to 313. It does not mean that it was traveling constantly at 11.2, because it was more than likely going faster in some areas and slightly slower in some areas. It is only an average speed over the entire run. Mr. DULLES. Over the entire run between what points? Mr. SHANEYFELT. Between frame 161 and 313. Mr. DULLES. Yes; but where, could you place that on that chart, for example? Mr. SHANEYFELT. Yes. Mr. DULLES. And describe the points? Mr. SHANEYFELT. This is frame 161 which is the frame where they have just gone under the tree, to frame 313 which is the shot to the head. So that it is that distance there which is 136.1 feet. Mr. SPECTER. In referring to those points, will you specify what exhibit number you are referring to there? Mr. SHANEYFELT. That is---- Mr. DULLES. I wonder if we could mark those points on that exhibit? Mr. SPECTER. Of course, Mr. Dulles. That is Commission Exhibit No. 883, is it not, Mr. Shaneyfelt? Mr. SHANEYFELT. Yes. Mr. SPECTER. Will you take the first point Mr. Dulles has referred to and mark it as point X. I think we already have some letter designations in the early part of the alphabet. Mr. McCLOY. Where is that point? What significance is that point? The first point? Mr. SPECTER. This frame 161---- Mr. McCLOY. Yes. Mr. SPECTER. Is the first frame we have on the Zapruder film. Mr. DULLES. It is only to get the speed and distance here. Mr. McCLOY. It has no relation to any shots. Mr. DULLES. No relation to shots. Speed and distance. Mr. SPECTER. It is the first frame we have where the marksman has his last clear shot of the back of the President's neck before it passes under the tree without adjustment. Is that correct, Mr. Shaneyfelt? Mr. SHANEYFELT. That is correct. What letter designations did you want? Mr. SPECTER. Mark 161, frame 161, with the letter designation X, if you will, please. Mr. SHANEYFELT. And 313? Mr. SPECTER. With the letter designation Y. Mr. McCLOY. The record ought to show the two points are the point which you merely calculated the speed at which the car is going, isn't that right? Mr. SHANEYFELT. That is correct. Mr. McCLOY. Yes. Mr. DULLES. Between those two points the car went at an average speed of 11.2 miles an hour? Mr. SHANEYFELT. That is correct. Between point X and Y on Exhibit No. 883 the speed of the car was determined to be an average speed of 11.2 miles per hour. Mr. DULLES. How long did the car take to go that distance, do you know, translated into time? Mr. SHANEYFELT. 8.3 seconds. Mr. DULLES. 8.3 seconds.