XP for killing/stopping NPC

[docgeo]

I have made some NPCs as reoccurring nemesis for my group.

I might be looking right over it but I can't find how I calculate XP for them defeating them.

Can anyone help me out?

thanks

[Dimirag]

Treat their level as HD for XP calculations, add * if the npc has special abilities outside what his race and class provides.

[docgeo]

thanks!