deletions | additions       diff --git a/Forces and geometry optimization.tex b/Forces and geometry optimization.tex  index 81d709c..cc5cc17 100644  --- a/Forces and geometry optimization.tex  +++ b/Forces and geometry optimization.tex 
...
However, the main benefit of using eq.~\ref{eq:forcesgrad} is that it is more precise when discretized on a grid, as the orbitals are smoother than the ionic potential. We illustrate this point in Fig.~\ref{fig:n2forces} where the forces obtained with the two methods  are compared. While taking the derivative of the atomic potential  gives forces with a considerable oscillation due to the grid discretization, grid,  using the derivative of the orbitals gives a force that is smoother. consirably smoothe.