NOTE: most of these examples are provided to demonstrate the functionality of pEFF, i.e. as illustrative examples, and should not be used w/out including the proper equilibration procedures, or data files with unit cell sizes appropriate for minimum image calculations. Also, most of the electron masses are set to 1, instead of the true electron mass in amu. If the electron mass is set to the true value, the recommended integration time step should be 0.0001 (i.e. need to change it with the "timestep 0.0001" command)