available on the internet. The HSCA examined these photographs and X-rays before rendering its opinions as to bullet entry and exit locations, and obtained testimony from autopsy physicians that these were the correct photographs and X-rays taken during the autopsy. Importance of bullet entry level to theory The importance of how low or high the bullet struck the President in the back is a matter of possible geometry. The Sibert/O'Neill FBI autopsy report original made by two FBI agents (Special Agents James W. Sibert and Francis X. O'Neill) present at the autopsy preserves genuine confusion among the medical doctors present during the autopsy, caused by apparent lack of an exit wound, which was cleared up later in the official report after new and more complete information became available (the exit had been hidden by a tracheotomy incision). This report does note that the doctor (Commander Humes) at the time said that he was unable to locate an "outlet" for the wound in Kennedy's shoulder (not his back). At the time of the autopsy, toward the end of the procedure, initial probing of the shoulder wound suggested the bullet entered the base of Kennedy's neck at a 45 to 60 degree angle. At least two shell casings were found near the window at the southeast corner side of the TSBD on the sixth floor, and with the fact that movement was seen in the same corner window from bystanders below, just previous to when the cars arrived, and also because of the proximity of the initial investigations'shell casing evidence collected, to that, of the nearest window. A window that was said by some to have been partly opened at the moment of the shots, all leading the Warren Commission to focus solely on this location in their investigation as the source of gunfire and so decided to have a team of surveyors measure the angles from that said window to the locations of the street, which, would roughly correspond to the location of Kennedy seated in his limousine, when seen in the Zapruder Film, riding along Elm Street at frames 210, and 225.} During so, it was found that the downward angle from the horizontal, was 21.57 degrees at frame 210, and 20.18 degrees at frame 225. The street sloped at 3.15 degrees (3° 9') away from the depository building. This would have made the angle through the president between 17