A-26 Upper Turret Angles

Diagram of the upper turret fire interruption angles for the A-26, from: Pilot’s Handbook for Army Models A-26B and A-26C Airplanes, AN 01-40AJ-1, August 1945, revised January 1946.

This illustration shows the gunfire intercepting areas and the margins of interruption (approximately) and indicates the limits of gunfire from the upper turret for efficient use of the guns by flight personnel.