Fig. A.1
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Top:Power spectrum of the combined iodine and LFC light as in Fig. 1. The top 20 % of the data points are used for phase correction and shown in black. Bottom: Phase reconstructed from the symmetric part of the interferogram following the ’Mertz’ algorithm. The red line shows a spline fit to a running median of the phase data. This smooth curve is used for phase correction.
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