Mass-loss rate (top) and envelope mass (bottom) as a function of time prior to collapse in the models with P_i = 1995 d (left) and P_i = 1413 d (right), and with different q_i shown in different colors (see legend). The vertical gray bars highlight, from left to right, the moment of ignition and depletion of carbon in the core. The markers represent the start of unstable mass transfer. Model C1413−0.10 is not shown, but its behavior is similar to Model C1995−0.20.