Efficient calculation of general Voigt profiles.

The authors present an accurate and efficient program for the computation of OIL profiles, generalizations of the Voigt profile resulting from the "one interacting level" model of Ward et al. (1974). These profiles have speed dependent shift and width functions and have asymmetric shapes. The program contains an adjustable error control parameter and includes the Voigt profile as a special case, although the general nature of this program renders it slower than a specialized Voigt profile method. Results on accuracy and computation time are presented for a broad set of test parameters and a comparison is made with previous work on the asymptotic behavior of general Voigt profiles.