Fig. 1.
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Phase of the cross-spectrum of the images at the reference level and at line chord 15 in the Fe I 630.15 nm line as function of the spatial frequency. The spectrograph slit is oriented along the north-south axis at cos θ = 0.81. Red (blue) symbols: THEMIS data in the southern (northern) hemisphere. Green symbols: HINODE data at the same heliocentric angle in both hemispheres.
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