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Fig. 7

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Brightness-temperature contribution functions (with maxima normalized to unity) at 3 mm a) and at 1 mm b) for a number of sunspot models including the model of Avrett (1981) (dot-dashed curve), of Severino et al. (1994) (dashed curve), and of Fontenla et al. (2009) (dotted curve). For comparison the contribution function for the model FAL − C is shown with a thin solid black line.

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