Wilson depressions. Left panel: difference in average geometrical depth of the τR = 1 surface between magnetic (B(τR = 1) > 750 G) and non-magnetic area (B(τR = 1) < 750 G) as a measure for the depth of the Wilson depressions. Right panel: downward shift of the optical surface within the magnetic flux concentrations in terms of pressure scale height (measured outside the flux concentrations).
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