Fig. 4.
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Spatial distribution of the dimensionality of Stokes I (top panel), linear polarization (second panel), and Stokes V (third panel), defined as the number of PCA components needed to reproduce such signals under a threshold of σ = 10−4. The bottom panel shows a binary mask, where white pixels mark the spectra whose total dimensionality, 𝒟(I) + 𝒟(L) + 𝒟(V), is larger than 80.
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