Fig. 2.
Flaring spectra observed by the IRIS. Panel a: time evolution of the line profiles in Fe XXI 1354.08 Å. Panels b−f: spectral line profiles (black) and their double Gaussian fitting results (orange) with a linear background (green) at the time indicated by the yellow lines in panel a. The turquoise line is Fe XXI 1354.08 Å, and the purple line is C i 1354.29 Å. The zero velocity is set to the rest wavelength of Fe XXI 1354.08 Å.
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