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ErFC(X)
ErFC: REAL function, the `KIND=' value of the type being that of argument X.
X: REAL; scalar; INTENT(IN).
Intrinsic groups: unix.
Description:
Returns the complementary error function of X:
`ERFC(R) = 1 - ERF(R)' (except that the result might be more
accurate than explicitly evaluating that formulae would give).
See erfc(3m), which provides the implementation.