Quality combat modifier in F 14?

[Kuriltai]

Quality Fire Modifiers
There is a Quality Fire Modifier Parameter Data value, which is by default equal to one, that applies to fire modifiers for A and B units below.
• If the Quality of the firing unit is A, then +20% times the Quality Fire Modifier value applies.
• If the Quality of the firing unit is B, then +10% times the Quality Fire Modifier value applies.
• If the Quality of the firing unit is C, then no firing modifier applies.
• If the Quality of the firing unit is D, then a –20% modifier applies.
• If the Quality of the firing unit is E, then a –40% modifier applies.
• If the Quality of the firing unit is F, then a –60% modifier applies.