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Measures of exoplanet bulk densities indicate that small exoplanets with radius less than 3 Earth radii (R_⊕) range from low-density sub-Neptunes containing volatile elements¹ to higher-density rocky planets with Earth-like² or iron-rich³ (Mercury-like)...

Context. Understanding stellar activity in solar-type stars is crucial for the physics of stellar atmospheres as well as for ongoing exoplanet programmes.

Aims. We aim to test how well we understand stellar activity using our own star, the Sun, as a test...