[gmx-users] dg/dl unit

[rob yang]

Hello,
I am just wondering what the units for dg/dl mean in a free energy 
perturbation run. I get a graph of dG/dl (KJmol-1nm-2l-1) vs time (ps). Now, 
ideally i want KJmol-1lambda-1 vs lambda graph so that i can integrate it to 
get back a value that is KJ/mol.
I am just wondering what (nm-2l-1) unit means and if it is related to ps as 
i suspect.

thank you very much in advance.

rob