Question: Bow DPS with Multiple Projectiles

I am and Lightning Arrow Deadeye. When switching weapons, I will look at my lightning arrow skill DPS to gauge the new weapon. I have a single shot bow that leaves me at LA DPS 3800, but I got a nice Adv Dualstring that will have LA DPS 3100, but shoot 3 arrows. Does that mean the 3 arrows are 3100 each, or all 3 combined are 3100 DPS? Thanks!