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Fig. 8.

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Flare intensity variation along the IRIS slit at different wavelengths at the preflare (01:43:41 UT) (panel a) and flare (02:04:28 UT) (panel b) times. The different colors of the curves show the different wavelengths. The intensity variation is constant at the preflare time, whereas the curve shows two peaks at y = 70 and 80 pixel at the flare time. The counts are lowest at the slit position y = 180 pixel. These three positions are chosen as the reference of the quiet-Sun and the Balmer enhancement.

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