Incident continuum SED of Mrk 110 (black line) obtained from a fit of HST continuum data points and the XMM-Newton EPIC-pn spectrum (observation ID 0840220701), taken simultaneously with the HST COS observations. The model consists of the disc black-body component (dbb, dot-dashed orange curve), Comptonisation (comt, dashed blue line) dominant in the extreme-UV and soft X-rays, power law (pow, dotted green line), cut off on both ends at 13.6 eV and 150 keV, and finally a Gaussian line (gaus, solid purple line) for the 6.4 keV iron feature. The model parameters are given in the text.