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Example of rastered images in selected lines from a quiet Sun area on 28 May 2020 from 16:05:37 to 16:50:24, using a 4″ slit and 20 s exposure. Solar distance: 0.57 AU, 1″ = 413 km on the surface. Images are arranged in the order of increasing formation temperature, from top-left: H Ly beta – 10 000 K, C III – 60 000 K, S V – 140 000 K, O IV – 140 000 K, O VI – 260 000 K, Ne VIII – 550 000 K. The yellow circle shows the location of the brightest source (a ‘beacon’ – see text for details).
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