Determination of the refractive indices with the Swanepoel method for the PAMPRE Titan 2 haze analog. The point-by-point fitting approach (left) shows small variations in k in the visible-NIR and reflects the propagation of uncertainties on n and the film thickness into the calculation of k. For n, a value can be derived for each fringe extremum (red points), and the different data points are subsequently fit with a Cauchy function to obtain a continuous spectrum in the entire range from UV to near-IR.