Fig. 1
Left: original Stokes I continuum contrast variation of the employed SOT/SP images. The solid line is a quadratic fit with quadratic and linear coefficients of 0.00025 ± 0.00009 and − 0.019 ± 0.006. Right: Stokes I continuum contrast variation after each image was convolved using an artificial defocus. The solid line is a constant drawn at 6.75%.
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