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Fig. 3


Density plot of intensity (arbitrary units) vs. wavelength relative to line core for all points in the summed flatfield data before the first iteration (top, where the line center has been determined using a parabolic fit to the line core) and the same plot after the second iteration (bottom). The average line profile φ(λ), described by a spline curve through several nodes (red plusses), is overplotted in red.

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