Dependencies of a) cold and b) warm dust luminosities on Hβ luminosities for galaxies from the Herschel sample. Solid lines are linear maximum-likelihood relations, while dotted lines are one-to-one relations between dust luminosities and total luminosities of ionising radiation L_ion~100L(Hβ). I Zw 18 and SBS 0335−052E are encircled.