Comparison of H-band spectra of the same star measured in just IFUs 3, 12, and 20, to spectra of the same star measured in the other IFUs. The spectrum is shown in green in the background. The blue lines show the ratio between the spectra in 2 different IFUs from the same instrument segment (with the red lines indicating a ratio of 1 for reference). Note that one can see a ripple effect at 1.5–1.6 μm, which is discussed in Sect. 4.2 and shown more clearly in Fig. 13 for the same dataset. The numbers on the right are respectively, the mean and standard deviation of this ratio (for regions where the signal-to-noise is above a minimum threshold). This suggests that using just 3 arms to calibrate all IFUs is sufficient at the level of precision of a few percent.
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