Fig. A.1

Hα line profiles (solid lines) from the kernel K1 together with a reference profile (black dotted lines) taken from a quiet region at the bottom-left corner of the field of view. The line centre λ0 is denoted by dashed lines. FWHM of those profiles that can fitted by a single-Gaussian function are noted accordingly, and their fitting Gaussian profiles (orange dotted lines) are overplotted.
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