[gmx-users] How do I calculate the difference between two energy values?

[minky son]

Dear GROMACS users,

I have been studying free energy calculation in Justin tutorial.

I performed VDW decoupling and coulomb decoupling simulations separately.

I obtained the free energy values for each simulation using gmx bar.

coulomb decoupling simulation = 60.88 +/- 0.23 kJ/mol
VDW decoupling simulation= -9.48 +/- 1.31 kJ/mol

So, I want to calculate the sum of the two energy values,

specially the second term (51.4  +/- ???).


Please give me any advice to solve this.

Regards,