[gmx-users] Fwd: How to calculate protein-surface interaction energy

[James Lord]

Dear users,
I want to calculate the interaction energy (energy versus time) of a
protein (Lysozyme) adsorption process (20ns) on to a solid surface
(polyethylene).
when I use gmx energy -f md20ns.edr -o energy.xvg and then selecting total
energy I end up with a messy graph!!! Am I doing some thing wrong?
secondly, Is there any way to average the energy over the last 10ns of MD
trajectory in Gromacs??
Cheers
James