Fig. 2.
Contour plot of the relative errors of the three approximations for the Voigt function implemented in RASCAS. Left: approximation from Tasitsiomi (2006). Middle: approximation from Smith et al. (2015). Right: W4 approximation from Humlíček (1982). Bluer means more accurate, while redder means less accurate. White parts have a relative error better than 10−12. The transition between light blue and light red is at 10−4.
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