Δtproto for the basic models (purple circles), for the models with diffusion only (orange stars), and for the models with diffusion+rotation (blue squares) as a function of proto-WD mass for Z = 0.02 (top panels), Z = 0.01 (second panels), Z = 0.001 (third panels) and Z = 0.0002 (bottom panels). The left-hand panels show a linear scale in Δtproto while the right-hand panels show a log scale. Open symbols denote models that experience hydrogen shell flashes, whereas filled symbols denote models that avoid flashes. The grey shaded regions indicate temporary Roche-lobe detachment.
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