Fig. 3
Calibration verification. All curves refer to the mean quiet Sun spectrum. Top panel: observed Stokes I (black) and best-fit profiles obtained with the SIR code and a varying number of nodes (red − 1−, blue − 2− and green −5−). Bottom panel: temperature stratification from the HSRA, VALC and HOLMU (black solid, dotted, and dashed lines, respectively). The color-code is the temperature inferred by the application of the SIR inversion code using a varying number of nodes as in the top panel.
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