Internal abundance by mass of selected chemical elements versus the outer mass coordinate for the 1.156 M_⊙ WD models resulting from the evolutionary scenarios we studied. From top to bottom: ONe WD model from Camisassa et al. (2019), the CO WD model resulting from reduced mass loss during progenitor evolution, the CO WD model implied by rotation, and the merged CO model. Models are shown at the beginning of the cooling track before the core mixing induced by the mean molecular weight inversion.