Vertical gradient of B, ΔB/ Δd, between the photosphere and upper chromosphere as a function of r/Rspot. Solid curves represent ΔB/ Δd estimated with the average value of B in the photosphere. Dashed and dot-dashed curves show ΔB/ Δd from log τ = 0.0 and log τ = − 2.3, respectively. Panels a and b correspond to 14 and 16 November 2010, respectively.
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