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Fig. 8


V/I scatter plot of the red Fe i 6302.5 Å line vs. the green Fe i 5250.2 Å line, for an observational sample of 11 disk-center recordings in “simultaneous” mode, carried out at IRSOL on August 11, 2012. Both the larger scatter of the points around the regression line (solid) and its deviation from the WFS line (dashed) are due to the combined effects of differential Zeeman saturation and differential thermodynamic effects.

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