**Table 2:** System parameters of sdB+dM binaries similar to PG 1336-018^a.
	Ref.	P (d)	$M_{\rm {sdB}}$ ( $M_{\odot }$ )	M₂ ( $M_{\odot }$ )	$I_1\omega/h$	$\alpha$	$\gamma$
HW Vir	Wood & Saffer (1999)	0.117	0.48	0.14	0.10	0.34	2.81
PG 1336-018	Vuckovic et al. (2007)	0.101	0.39	0.11	0.80	3.09	1.29
			0.47	0.12	0.11	0.36	2.76
			0.53	0.13	0.17	14.4	1.18
HS 0705+6700	Drechsel et al. (2001)	0.096	0.48	0.13	0.10	0.32	2.79
HS 2231+2441	Østensen et al. (2007a)	0.111	0.47	0.075	0.20	0.59	2.61

^a The $\alpha$ - and $\gamma$ -values given here correspond to the case that the entire hydrogen envelope was ejected at the tip of the RGB. Whenever the sdB mass allows it, we assumed that helium was ignited degenerately in a flash, indicated by normal font style. The CE parameters in boldface correspond to non-degenerate helium ignition. If $I_1\omega/h<1/3$ , the CE is assumed to be formed by dynamically unstable RLOF. If $I_1\omega/h>1/3$ , the CE is assumed to be caused by a tidal instability.

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