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Input is keyword driven with sensible defaults
in most cases. The last keyword will usually be POINTS, after which
the starting geometry is specified, one atom per line, by the atomic symbol (case
insensitive) and the corresponding , and coordinates. For potentials that
are coded within OPTIM there will always be an assumed unit system.
OPTIM determines the potential to be used from the atomic
symbol of the last atom, and various symbols have evolved for different systems, as
described in §5. Free format may be used within each line. Blank lines are ignored,
but there must not be any blank lines after the POINTS keyword.
The odata file