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The `loop-spec` is used in the calculation of correlation
functions of atomic positions projected onto the normal modes.
Unfortunately, documentation on this is very skimpy, and anyone who is
interested will have to dive into the code to understand what is going
on.

The `loop-spec` syntax is as follows:

LOOP-SPEC ::= LOOP [DIAG] [BRIEF] repeat([integer [integer [integer [integer]]]] del) deldel

`BRIEF` reduces the amount of output showing what
calculations will be done.