Difference between 'slotted wing' and 'fixed slat'

Leading edge slats and Keller Flaps Page 2 fixed slot leading edge Slots In contrast the McDonnell Douglas F-15 has a fixed leading edge because of the type of airfoil used for fixed slot A leading-edge slot is a fixed aerodynamic feature of the wing of some aircraft to reduce the stall speed and promote good low-speed handling qualities

brobet slot Fixed-Wing Aircraft Numerical Investigation of Leading Edge Blowing and Optimization of the Slot Geometry for a Circulation Control Airfoil