Stellar coronal emission of Gl 486 from ultraviolet spectroscopy. Top: emission measure distribution from Hubble/STIS data. Thin, coloured lines represent the relative contribution function for each ion (the emissivity function multiplied by the emission measure distribution at each point). Numbers within the graph indicate the ionisation stages of the species. Bottom: observed-to-predicted line flux ratios for the ion stages in the upper figure. The dashed lines denote a factor of two.