Merged fits of the dust depletion (δ_X) as a function of [Zn/Fe] for all the elements (left). The elements are sorted by depletion strength. The slopes of the fits of the depletion sequences B2_X (or refractory index) as a function of the respective element condensation temperature T_c (right). The dust depletion relation with B2_X is described by δ_X = A2_X + B2_X × [Zn/Fe], The condensation temperatures T_c are compiled by Lodders (2003). Elements with higher condensation temperatures are more strongly depleted into dust.