The first number is the 8.4 value, the second the difference from 8.3. To avoid any confusion, I am using EU depression/elevation measures, not the RU ones. So, if it says “depression 6 (1)”, it means “the gun depression was buffed by one degrees”, where for example “elevation 17 (-8)” means “elevation was nerfed by 8 degrees”. Logically, “depression 6 (-1) would mean the depression was nerfed by 1 degree” and so on.

总结下就是俯角depression, 仰角elevation 的 nerf(负数) 和 buff(正数):

T-50-2 削弱仰角, 加强俯角
F-34 gun elevation 17 (-8) ,  depression 6 (1)

T-54 削弱
LB-1 gun elevation 20 (-3),   depression 5 (-2)

Tiger P 削弱
88mm L/56 elevation 17 (-1)
105mm L/28 elevation 17 (-1)

E-75 加强
105mm L/68 depression 8 (1)
128mm L/55 depression 8 (3), elevation 24 (6)

US gun 75mm M3 L37A 削弱
Elevation: 20 (-5),  Depression: 5 (-5)

US gun 120mm T179 (T57) 削弱
Elevation: 12 (-3)

Renault BS
Suspension M17 braking force: 4500 (-31000)
Suspension M26 braking force: 5000 (-30500)
(SS: this basically means Renault BS stops being able to stop on the spot as if “glued” I think)

D1 加强
37mm APX SA18 depression: 20 (18)
37mm SA38 elevation: 17 (4),  depression: 6 (4)

AMX M4 (1945) 加强
90mm DCA30 depression: 10 (5)
90mm F3 depression: 10 (5)
90mm DCA 45 depression: 10 (5)
105mm 13TR depression: 10 (5)