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Table A.1.

Summary of parameter combinations tested and the corresponding reasons for unsuccessful outcomes.

M1 M2 β Porb (d) Reason for failure
3.5 2.7 0.25 1.8 Accretor overfills its Roche lobe; need lower M2 and smaller β.
2.301 2.300 0.40 50 He flash occurs before the end of stable mass transfer.
2.301 2.300 0.40 25 He flash occurs before the end of stable mass transfer.
2.301 2.300 0.40 10 He flash occurs before the end of stable mass transfer.
2.301 2.300 0.40 5 M2 too low.
2.301 2.300 0.30 4 Accretor overfills its Roche lobe.
2.31 2.29 0.20 4 Critical rotation problem.
2.31 2.30 0.20 5 Critical rotation problem.
2.51 2.50 0.40 10 Critical rotation problem.
2.51 2.50 0.40 25 Critical rotation problem.
2.501 2.500 0.40 25 Critical rotation problem.
2.501 2.500 0.50 50 He flash occurs before the end of stable mass transfer.
2.101 2.100 0.20 50 He flash occurs before the end of stable mass transfer.
2.101 2.100 0.20 10 He flash occurs before the end of stable mass transfer.
2.101 2.100 0.10 7 Mass-transfer rate too high (Ṁ > 10−2).
3.001 3.000 0.80 3 He flash with envelope too large; sdB mass too high; M2 not massive enough;
2.401 2.400 0.30 3 Critical rotation at M2 ∼ 3.60
2.401 2.400 0.35 4 Accretor overfills its Roche lobe.
2.401 2.400 0.35 5 Accretor overfills its Roche lobe.
2.401 2.400 0.35 3 Critical rotation (M2 ∼ 3.56).
2.401 2.400 0.25 3 Critical rotation; M2 core too small for massive WD.
2.501 2.500 0.25 3 Critical rotation (M2 ∼ 3.77); final Porb only 166 d; M2 core too small.
2.501 2.500 0.15 3 Critical rotation (M2 ∼ 3.87); sdB mass OK; M2 core too small.
2.601 2.600 0.15 3 Critical rotation (M2 ∼ 4.0); sdB Teff too low; M2 core insufficient.
2.701 2.700 0.15 3 Critical rotation (M2 ∼ 4.14); sdB parameters almost OK; M2 core still too small.
2.701 2.700 0.15 3 Teff improves but log g and radius do not; accretor overfills its Roche lobe.
2.701 2.700 0.15 3.5 Accretor overfills its Roche lobe.
2.710 2.700 0.10 3 sdB parameters uncertain; accretor overfills its Roche lobe.

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