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src/s/c/scipy-0.13.3/scipy/special/tests/test_basic.py   scipy(Download)
    def test_dawsn_consistent(self):
        self._check_variant_func(
            cephes.dawsn,
            lambda z: sqrt(pi)/2 * np.exp(-z*z) * cephes.erfi(z),
            rtol=1e-12