I was looking at the pictures of F-7PG and found that its windshield is single piece as compared to the 3-piece windshield of the F-7P.
We see that 3-piece windshield in the A-5, F-6, F-86, F-4 Phantom, F-14 Tomcat, Jaguar, Tornado, Mirage F-1 etc but that disappeared in all new fighters like F/A-18, F-15, F-16 etc.........
In Mirage-3 and Mirage-5, the forward canopy windshield was too 3-piece but later the Mirage-2000 changed to single piece windshield.....
so why was it necessary before to have a 3-piece windshield?
what was exactly the purpose of this structure of the windshield (the forward canopy)....perhaps for housing the gunsights etc