Fig. 4.
As a function of B, the width of the Fe I 6173 Å line, relative to the quiet-Sun level, about disc centre (0.94 < μ ≤ 1.00). The relative line width of network and faculae, which is essentially their contrast in the line width map, is derived in an analogous manner to the intensity contrast (Sect. 3.2). The filled circles and error bars have the same meaning as in Fig. 3.
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