Compute Dawson(z) = sqrt(pi)/2 * exp(-z^2) * erfi(z), Dawson's integral for a complex argument, using w_of_z except for certain regions.
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Compute Dawson(z) = sqrt(pi)/2 * exp(-z^2) * erfi(z), Dawson's integral for a complex argument, using w_of_z except for certain regions.