... Research

The National Center for Atmospheric Research in sponsored by the National Science Foundation.

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... depth

An inversion of Hinode data from a different sunspot has been presented by Bellot Rubio et al. (2007) and Ichimoto et al. (2007). They considered only the Milne-Eddington case, in which physical parameters are assumed to be height-independent.

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... plane

We do not convert to vertical scale Z^* from the optical depth scale $\tau$ since this requires additional assumptions (i.e. hydrostatic equilibrium) that are not fully justified.

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