ship.lua need help. about The CIWS (Close-In Weapon System) position

[happy51d]

In ship.lua ,these codes are for The CIWS (Close-In Weapon System) at the forward right position：

GT.WS[ws].angles_mech = {
                            {math.rad(180), math.rad(-180), math.rad(-5), math.rad(70)}
                        }
GT.WS[ws].angles = {
                     {math.rad(10), math.rad(0), math.rad(7), math.rad(70)},
                     {math.rad(0), math.rad(-150), math.rad(-5), math.rad(70)},
                     {math.rad(-150), math.rad(10), math.rad(19), math.rad(70)}
                   }

so,how to write codes for The CIWS (Close-In Weapon System) at the forward left position?

and would you plz exlain these codes line by line？

 

thanks in advance.