It's going to be fairly fuzzy anyhow, because that's just the nature of AOE. And the AOE mechanics are rather complex because they have a range limiter, a number of ships that they can hit based on a calculation involving their range, and so on. Depending on exact ship positions, you can never count on hitting definitely more than one ship with AOE anyhow -- of course you often will hit tons of ships when they are in a group, but that's really circumstantial, right?