Fig. 5

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Top: contribution function as a function of wavelength and optical depth. The function is normalised so that the maximum value at each wavelength is equal to 1. The centre-of-gravity of the contribution function at each wavelength is shown with the red line. Bottom: the contribution function (not normalised) at the line centre of the three lines shown in the top panel. The centre-of-gravity is shown here with the dashed lines.
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