Constraints on the MDM (ΛMDM) model from weak lensing (KiDS-1000) in green, the CMB (Planck-18 TTTEEE) in blue, and the combined WL+CMB in red (dotted line). TheΛMDM model is parametrised by the thermal mass of the hot species (m_hdm) and the fraction of hot-to-total DM (f_hdm). The top-left corner of the plot corresponds to the excluded region. All contours are shown at the 95% confidence level.