I really like to know, what your reward is if you kill a hostile NPC in a battle. Is there a table or something? I know it depends on the ship class you are flying and the enemy level (at higher level the enemy level seems to belong to a specific ship class as well: i.e. lvl21 is Gunboat, lvl22 Destroyer etc.)
My current knowledge is pretty limited as you can see. I believe there is a pattern behind this, but would need much more data to verify (i.e. "Cruiser vs lvl21" is 80% of 900k and "Dreadnaught vs Gunboat" is 40% of 900k -> Battlecruiser might be 60% of 900k => 540k).
(The number in the first row is the level of the NPC)