Get_losses

[Akash Tyagi]

Hello everyone, I am trying to use get_losses command and it's quite easy
but i am not getting one thing in that command,
mpc=loadcase(case5);
results=runpf(mpc);
[loss,fchg,tchg,dloss_dv]=get_losses(results);
what is 'dloss_dv' given means??