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# S

> The value of the spin quantum number is given by this option. The default is determined by the value of the multiplicity. This is used for two things: (1) determining the phase of the redundant half of the CI vector when the component is used (i.e., MS0 = `TRUE`), and (2) making sure the guess vector has the desired value of (if S_SQUARED is `TRUE` and ICORE = `1`).

> - Type: double
> - Default: 0.0

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