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To compare the results from two dynamical calculations, one must
perform the following steps: First, one must invoke a `COMPARE`
command, see Comparisons, to establish the comparison PSF and
other comparison data structures and to construct the matching of atoms
between the two PSF's. If the PSF is not changed, then any averaging
data structures will be assigned from the main calculation to the
comparison calculation. Then, any additional comparison averaging data
structures must either read in or constructed for both main and
comparison. The `COMPARE` option in the `READ`, `ACCUM`, and
`COMBINE` command can be used to direct the averaging data
structures to the comparison data structure collection. Finally, the
`BUILD` command using the `DIFF` option, see Building Tables, can be used to build tables which are the differences between
the main and comparison dynamical averages.