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# MRCC_OMP_NUM_THREADS

> Sets the OMP_NUM_THREADS environment variable before calling MRCC. If the environment variable `OMP_NUM_THREADS` is set prior to calling PSI4 then that value is used. When set, this option overrides everything. Be aware the `-n` command-line option described in section Threading does not affect MRCC.

> - Type: integer
> - Default: 1

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