Fig. 2

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ADEGREE test: Variation in the measured σ as a function of the degree of the additive polynomial. The spectra are ordered from top to bottom and from left to right in descending S/N (shown in each panel in parentheses). The larger red dots are the ADEGREE chosen for the fiducial fit, and the shaded blue region shows a variation on the σ from the median value of ±2.5%.
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