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Quiet-Sun intensity distribution in the IRIS Mg II wavelength band at the preflare time (01:43:41 UT). Panel a: full spectra of the Mg II band between λ = 2784 Å and λ = 2835 Å (50 Å), the dashed horizontal black lines indicate y = 10, 170, and 180, which represent quiet-Sun regions. Panel b: spectral profile of the full range of Mg II lines for the three y pixel values (10, 170, and 180). Panels c and d: zoom of two parts of the spectral profile at the two ends of the wavelength band, shown by two cyan vertical lines right and left in panels a and b, respectively. The intensity is calibrated in erg s−1 sr−1 cm−2 Å−1.
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