*.py loads the trajectory from a *.gro file (here traj.gro as example) and calculates an autocorrelation function for the pairs listed in the file inputCORR

correlation.py: calculates the autocorrelation function g(tau)=<P2[u(t).u(t+tau)]>, where u(t) is the internuclear vector connecting the pair of nuclei listed in inputCORR

Note: The module MDtraj is used.