Fig. 2
Continuum calibration using a comparison between the FTS spectrum and the measured spectrum. The top panel shows the residual spectrum (black) and the lowpass filtered curve used for the calibration (red). In the bottom panel we compare the degraded FTS spectrum (red) with the calibrated spectrum (black). Δ λ = 0 refers to theFe I 15 648.5 Å spectral line in Table 1.
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