Evolutional tracks of the Skumanich model: mass-transfer rate as a function of orbital period for different donor masses–0.6 M_⊙ (top left), 0.8 M_⊙ (top right), 1.0 M_⊙ (bottom left), and 1.2 M_⊙ (bottom right). Each panel shows the evolutionary tracks for three different WD masses: 0.6 M_⊙ (blue), 0.8 M_⊙ (red), and 1.0 M_⊙ (green). The purple pentagrams denote observational data obtained from Pala et al. (2020, 2022), and Sarkar et al. (2024), as well as the additional sources listed in Table A.1. All systems are initialized at an orbital period of 0.4 day.