Energy Plots

I made plots of the position and the specific energy as a function of time for the two runs with mass ratio 10:1. It looks like in fact, the heavy particle in both systems is losing energy. The first plot shows the particle released outside the virialized system, and the second plots shows the run where the heavy particle replaced one of the existing particles.

Here is the one released outside:


Here is the one released inside:


Note: the axes are different.