ARC-170: 2 firing arcs
SF TIE Fighter: 2 firing arcs
Fang Starfighter: 1 firing arc
Shadow Caster: 4 firing arcs
2 + 2 + 1 + 4 = 9 firing arcs in wave 9.
Yep, it adds up!
Wave 9: does it add up? A quick look at the numbers
10 is X in Latin.
XG1 gunboat?